Evidence dossier

CVE-2026-20805

Desktop Window Manager Information Disclosure Vulnerability

Exploited in the wild (CISA KEV since Jan 13, 2026). microsoft reports CVSS 3.1 5.5. EPSS estimates 5.1% exploit likelihood as of Aug 27, 2026.

58.3–71.1Priority evidence range

Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.

State: PUBLISHED
Published: Jan 13, 2026
Updated: Jul 30, 2026
Evidence coverage: 85%

Evidence chronology

What was known when

Download this view's receipt →

Source dateJul 16, 2026First observed by CASCAJul 19, 2026
CISA KEV
Exploitation cataloged: Microsoft Windows Information Disclosure Vulnerability
Inspect raw assertion
Field
observed_exploitation
Value
Microsoft Windows Information Disclosure Vulnerability
Original evidence ↗
Source dateSource date omittedFirst observed by CASCAAug 1, 2026
CISA-ADP
Record text: CISA ADP Vulnrichment
Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Original evidence ↗
Source dateSource date omittedFirst observed by CASCAAug 1, 2026
microsoft
Record text: Desktop Window Manager Information Disclosure Vulnerability
Inspect raw assertion
Field
container
Value
Desktop Window Manager Information Disclosure Vulnerability
Original evidence ↗
Source dateAug 27, 2026First observed by CASCAAug 27, 2026
FIRST EPSS
EPSS score: 5.12% probability · 91.76th percentile
Inspect raw assertion
Field
model_probability
Value
Probability 0.051160000000; percentile 0.917570000000
Original evidence ↗

ExploitationCatalog member

CISA KEV · catalog date Jan 13, 2026 · first observed Jul 19, 2026

Exploit likelihood5.12%

FIRST EPSS · score date Aug 27, 2026 · 91.8th percentile · first observed Aug 27, 2026

SeverityCVSS 5.5

microsoft · CVSS 3.1 · first observed Aug 1, 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

Microsoft Windows Information Disclosure Vulnerability

Inspect raw assertion

Field: observed_exploitation
Value: Microsoft Windows Information Disclosure Vulnerability

Source dateJul 16, 2026First observed by CASCAJul 19, 2026Original evidence ↗

CISA-ADPIndependent enrichment

Record text

CISA ADP Vulnrichment

Inspect raw assertion

Field: container
Value: CISA ADP Vulnrichment

Source dateSource date omittedFirst observed by CASCAAug 1, 2026Original evidence ↗

microsoftOriginal assertion

Record text

Desktop Window Manager Information Disclosure Vulnerability

Inspect raw assertion

Field: container
Value: Desktop Window Manager Information Disclosure Vulnerability

Source dateSource date omittedFirst observed by CASCAAug 1, 2026Original evidence ↗

FIRST EPSSOriginal assertion

EPSS score

5.12% probability · 91.76th percentile

Inspect raw assertion

Field: model_probability
Value: Probability 0.051160000000; percentile 0.917570000000

Source dateAug 27, 2026First observed by CASCAAug 27, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

16Underlying assertions

13Canonical products

16Target 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

Search scopeRoleOfficial link state

33 scope groups

microsoft · source assertedMicrosoftWindows 10 Version 1607Direct source scope

Affected: 10.0.14393.0 to before 10.0.14393.8783 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8783", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 10 Version 1809Direct source scope

Affected: 10.0.17763.0 to before 10.0.17763.8276 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8276", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 10 Version 21H2Direct source scope

Affected: 10.0.19044.0 to before 10.0.19044.6809 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.19044.0", "lessThan": "10.0.19044.6809", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 10 Version 22H2Direct source scope

Affected: 10.0.19045.0 to before 10.0.19045.6809 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.19045.0", "lessThan": "10.0.19045.6809", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 11 version 23H2Direct source scope

Affected: 10.0.22631.0 to before 10.0.22631.6491 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6491", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 11 Version 23H2Direct source scope

Affected: 10.0.22631.0 to before 10.0.22631.6491 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.6491", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 11 Version 24H2Direct source scope

Affected: 10.0.26100.0 to before 10.0.26100.7623 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.7623", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows 11 Version 25H2Direct source scope

Affected: 10.0.26200.0 to before 10.0.26200.7623 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.26200.0", "lessThan": "10.0.26200.7623", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2012Direct source scope

Affected: 6.2.9200.0 to before 6.2.9200.25868 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.25868", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2012 R2Direct source scope

Affected: 6.3.9600.0 to before 6.3.9600.22968 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.22968", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2012 R2 (Server Core installation)Direct source scope

Affected: 6.3.9600.0 to before 6.3.9600.22968 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.22968", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2012 (Server Core installation)Direct source scope

Affected: 6.2.9200.0 to before 6.2.9200.25868 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.25868", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2016Direct source scope

Affected: 10.0.14393.0 to before 10.0.14393.8783 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8783", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2016 (Server Core installation)Direct source scope

Affected: 10.0.14393.0 to before 10.0.14393.8783 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.8783", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2019Direct source scope

Affected: 10.0.17763.0 to before 10.0.17763.8276 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8276", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2019 (Server Core installation)Direct source scope

Affected: 10.0.17763.0 to before 10.0.17763.8276 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.8276", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2022Direct source scope

Affected: 10.0.20348.0 to before 10.0.20348.4648 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.20348.0", "lessThan": "10.0.20348.4648", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)Direct source scope

Affected: 10.0.25398.0 to before 10.0.25398.2092 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.25398.0", "lessThan": "10.0.25398.2092", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2025Direct source scope

Affected: 10.0.26100.0 to before 10.0.26100.32230 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32230", "versionType": "custom"}]

microsoft · source assertedMicrosoftWindows Server 2025 (Server Core installation)Direct source scope

Affected: 10.0.26100.0 to before 10.0.26100.32230 (custom comparison)

Source-reported scope

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

Inspect raw assertion

[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.32230", "versionType": "custom"}]

NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1607Vulnerable target · 2 assertions

Any version (unconstrained) (< 10.0.14393.8783)Canonical identity product-740fec3e9838b5eabe76ebe27e4d0d7a4cb2e0ef7e13923300d3d0b51e3fce1cLinked exact

Scope supported

Inspect raw assertions

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 1
Logic
OR
Version bounds
through excluding 10.0.14393.8783
Match ID
41d387b9-5e9d-47cb-b044-d7d10fffb458
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 0
Logic
OR
Version bounds
through excluding 10.0.14393.8783
Match ID
9a956d23-259e-450b-8406-feb2bbed1f39

NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_1809Vulnerable target · 2 assertions

Any version (unconstrained) (< 10.0.17763.8276)Canonical identity product-a3084138383423221f61594e86f5b295e5e254acd7ae5284f45e0877a084db43Linked exact

Scope supported

Inspect raw assertions

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 2
Logic
OR
Version bounds
through excluding 10.0.17763.8276
Match ID
dd4cbdab-7626-4048-8474-b1bd9c1f3255
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 3
Logic
OR
Version bounds
through excluding 10.0.17763.8276
Match ID
a6d4c631-2cc0-407c-9aca-7c151006598c

NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_21h2Vulnerable target · 1 assertions

Any version (unconstrained) (< 10.0.19044.6809)Canonical identity product-ec10c9f400f23fdf118887f60fe116ffde4adb76dcf118cdd3a7556fd033da3bLinked exact

Scope supported

Inspect raw assertion

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 4
Logic
OR
Version bounds
through excluding 10.0.19044.6809
Match ID
1895e186-5b2e-43cc-af1f-b5c95419d8c5

NVD CPE · OPERATING SYSTEMmicrosoftwindows_10_22h2Vulnerable target · 1 assertions

Any version (unconstrained) (< 10.0.19045.6809)Canonical identity product-a6295b9daad3ca57ce70751badba5b7fe99229c8a562cc7400e8cfef3daccaeeLinked exact

Scope supported

Inspect raw assertion

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 5
Logic
OR
Version bounds
through excluding 10.0.19045.6809
Match ID
b7cb5184-1ba1-4d71-8ae3-cf4c6b63a469

NVD CPE · OPERATING SYSTEMmicrosoftwindows_11_23h2Vulnerable target · 1 assertions

Any version (unconstrained) (< 10.0.22631.6491)Canonical identity product-026201767813843a6d53867bacde4a55c3035cb868c0a72434012c5e30dab148Linked exact

Scope supported

Inspect raw assertion

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
Official link
Linked exact
Role
Vulnerable target
Configuration
0 · node/0 · match 6
Logic
OR
Version bounds
through excluding 10.0.22631.6491
Match ID
8d675daa-4dce-4727-be5f-c954bbd252c4

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: 20
Mapping revision: cpe23-exact-mapping-v1
Observed cutoff: Aug 27, 2026

Retained assertion IDs

0f905afd-edf4-46d6-891d-308a1437e863119feaab-a4d1-47af-9cf4-b321de82f5922073b108-3007-4c6b-bf92-da94112b9db72edfa55b-1d56-4e2f-8994-32a4bb7b514a36bb9ef4-cec8-456a-a693-9f60a17071543c158c52-d182-4562-863b-98237119ae7b61b8e371-d3b2-4e05-a7d3-8caa3cb4187d69f3064d-a403-4397-98ad-3c529cec25f56c15fa34-397c-4b26-8d3e-9e6936f4afb97d4a3bbc-b181-4432-9d0e-ca1f0bfba8b380425b12-1700-4c9e-9ff2-024951ea8e168eb72db8-e1ad-4fe9-bcd8-6a8c4b0f4cd295228c44-18a6-42d0-8b1f-958060efcea1a970cef6-2721-4e17-aa81-ef57311bb941c450cecd-1892-407e-94c0-6b3721baf817e5eead30-cd15-457e-8415-5516e5cf2266f06dbb21-5fab-47ad-a9e2-111dd84ba9f7f50d4d09-e7ac-42e3-852f-3fb8e472ad6af94ea862-50de-4936-a89f-3911703cf75afb913249-5ce0-4554-8d60-ce0098fc841c

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: 16
Mapping revision: cpe23-exact-mapping-v1
Observed cutoff: Aug 27, 2026

Retained assertion IDs

045a6523-bbc1-4a3d-bcec-145a0407cbef0fa924e7-0483-4671-b494-5aaf8cc2564a4f0add00-a362-422e-86ed-6c723ea94b7d539b81ab-b3a7-43d6-8243-eb63ef20bc5e66ae2d68-11e1-4a8f-be1b-45fc3a91e1b775234aaa-465d-4734-925e-bb5fc50deb3e781afc73-7df0-4edd-8e1e-61736532b0418d6cb26b-f67d-4caf-ae88-cb602604c06193a58f09-1ee5-4295-8cfe-2e8616d2ee2d9c5eb7d0-0df5-4e17-b8a6-b730d626443d9e641a52-60d1-4a35-8cec-aa89e02930cfa6a813f0-e5ff-4bda-b825-f871a3591331aeda5d80-84f0-4876-9adf-bd6e478ea9efc48450bf-b031-43bb-8a23-5648d93f8818d06c87be-94d3-433a-b8a2-5b70b0fa71f1fcb72be7-8f73-466e-989c-a34ab65b629a

Assessments

CVSS by origin

5.5

secure@microsoft.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

5.5

microsoftCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Direct CVE/CNA normalized decisions

5.5Priority eligible

microsoft

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Validation: Valid match
Recomputed: 5.5
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.