CASCACascade Atlas

Evidence dossier

CVE-2022-24682

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021.

Exploited in the wild (CISA KEV since Feb 25, 2022). NVD reports CVSS 3.1 6.1. EPSS estimates 30.9% exploit likelihood as of Aug 26, 2026.

66.4–78.9Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

State
PUBLISHED
Published
Feb 9, 2022
Updated
Aug 6, 2026
Evidence coverage
85%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  4. Source dateSource date omittedFirst observed by CASCA
    mitre

    Record text: An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

    Inspect raw assertion
    Field
    container
    Value
    An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 30.93% probability · 98.12th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.309310000000; percentile 0.981190000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Feb 25, 2022 · first observed Jul 19, 2026

Exploit likelihood30.93%

FIRST EPSS · score date Aug 26, 2026 · 98.1th percentile · first observed Aug 26, 2026

SeverityCVSS 6.1

NVD · CVSS 3.1 · first observed Aug 6, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA KEVOriginal assertion
Exploitation cataloged

Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
mitreOriginal assertion
Record text

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

Inspect raw assertion
Field
container
Value
An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

30.93% probability · 98.12th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.309310000000; percentile 0.981190000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
31Underlying assertions
1Canonical products
31Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

2 scope groups

mitre · source assertedn/an/aDirect source scope
Affected: n/a
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "n/a"}]
NVD CPE · APPLICATIONsynacorzimbra_collaboration_suiteVulnerable target · 31 assertions
Any version (unconstrained) (>= 8.8.0, < 8.8.15); Version 8.8.15Canonical identity product-4e282fadbbcc212039ad71a0e7de43d3b9757c46bbe8fd5c086551b6c01bb56aLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9e39a855-c0eb-4448-ae96-177757c40c66
  2. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p26:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 20
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9bc02b35-7fc4-41ab-8d2e-2cd1896d84c6
  3. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p10:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b5924ffc-ba19-48b3-bf4d-0c2db3fcd407
  4. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p25:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 19
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4152cea2-9dc1-4567-bab3-9c36f74f77ea
  5. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p7:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 28
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    acd65c28-9716-4073-8613-c4af12684760
  6. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p27:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 21
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    0294cb8b-b0af-4a5c-b6b2-33f5bfffbd4c
  7. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p15:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    04becde0-f082-49fb-aca2-5c808902aa17
  8. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p8:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 29
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    2c58afff-848f-490d-a95c-03a267c2dc98
  9. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p13:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d772d4ba-9ed6-492c-a0d3-0af4f3d49037
  10. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 26
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a9a1314a-20c8-42d7-9387-d914999eeaf6
  11. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p23:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 17
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9030d096-87a1-4aff-bb7c-ce71990005b3
  12. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p9:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 30
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b62dc188-89a8-4aea-90ae-563f0bbefc54
  13. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 24
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ef2ee32d-04a5-46ea-92f0-3c8d74a4b82a
  14. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ffe7be6e-7a9a-40c7-b236-7a21103e9f41
  15. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p21:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 15
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    97402ada-ab05-4a92-920d-ea5363424fdf
  16. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p17:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 10
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    69a530d3-b84e-427b-bc92-64bbfef331be
  17. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p28:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 22
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    968a75b4-6d23-4b83-a8b5-777d8f151e04
  18. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p16:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    56558fd4-4391-4199-ba6b-b53f5dc30144
  19. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p20:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 14
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    34b07279-a26a-4eb1-8b33-885ad854018b
  20. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 25
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bb3c28ca-4c22-423e-b1c7-cbafbb91f4db
  21. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p18:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 11
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3c0dce7f-85a4-44c6-88c8-380b0bbbfa7e
  22. cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 8.8.0; through excluding 8.8.15
    Match ID
    0696bce7-5351-4b01-9593-ba8bfb2d3a9e
  23. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p6:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 27
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    cef091c5-8dc6-4a41-9e84-f53be703f71b
  24. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p11:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    7822d273-c2cb-4efe-b929-3d34c65e005e
  25. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p19:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 12
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    180af8b6-55ae-460c-b613-37fb697b5325
  26. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 13
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    6fcb5528-70fd-4525-a78b-d5537609331a
  27. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p22:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 16
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    697a1d34-ff0c-4f9e-8e91-34404a366d70
  28. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p14:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c2a468fe-b59b-4ce9-b9b2-c836eeafa3e8
  29. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p24:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 18
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f211a8b1-e33e-49be-9c18-31b1902eb4fe
  30. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p12:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f81528e8-fe3a-4c48-a747-34a3ff28bcab
  31. cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p29:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 23
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5e11bc24-56a3-4cab-b0b2-d2430cd80767

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
d4708b90-4770-4662-9919-45125a651b11
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
31
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
055d110a-459b-4b70-b6e2-06e929a65bad0db0bdcc-c3cf-49cb-b68f-846e2a15e147102915dc-035d-4f8f-bc71-dc74ba04cf7f14c6cca7-b83d-44d7-8959-f383b5dbdb801571e962-61db-4df1-a163-48fc634973b917a42978-2323-4ece-84ee-2aef77ae41581e199ff9-485e-43a5-8a79-f41669ef7ce82a1035f4-ae32-4121-9711-f718f9dc74242b503df3-c91b-4b57-b649-3c4cb886023a325b29bb-e6ce-4d96-bc73-e806857dec7370074914-8484-4f11-af01-d439a90cb7867e2f835e-cc74-4373-b8c5-14d80c5ce0e28a7f8268-78f6-4b7c-ae24-2f170afce045926a736f-0b8c-46c0-ade7-d5048c344dc19348bb29-6198-4e74-82ef-72500a33bf67949c1e96-cbad-4fa6-af20-2cad25c35d289ab8ded3-6324-4575-8910-87da4e2cda0fa4a82b23-5969-439d-9a9d-66d48eb37574afe60e52-f9e4-4396-8b2c-e8c5d428e1f5b1679b76-54d3-416b-8d63-13a03c5719e8b548212f-3d90-45ef-b348-77717e2d7276b5f1e028-9bea-4a2b-92c4-299cf75dcaf4b65cac49-8d82-42a2-8d07-90394a359286bcf5e059-1684-4e86-9683-3875bc68380bc5d38221-2a8b-4dc0-bb1b-a4931c6029ffcaca2df0-7ba7-4794-ab05-e89b210c7d57e66b92dc-ac24-468d-96da-def52a9f2204e7a25fd8-7466-4510-980b-296804aec9b9f0e76247-296f-4143-a9dd-07cb4bc760edf43f2e1e-afc6-4582-8c34-498687cb111ff7d35b10-8457-419d-9d2d-a0e2accc4b69

Assessments

CVSS by origin

6.1
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1
CVE Program sourceCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1
CISA-ADPCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Direct CVE/CNA normalized decisions

6.1Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Validation
Valid match
Recomputed
6.1
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.