CASCACascade Atlas

Evidence dossier

CVE-2026-3502

TrueConf Client Update Integrity Verification Bypass

Exploited in the wild (CISA KEV since Apr 2, 2026). checkpoint reports CVSS 3.1 7.8. EPSS estimates 5.7% exploit likelihood as of Aug 27, 2026.

66.9–68.5Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

TrueConf Client downloads application update code and applies it without performing verification. An attacker who is able to influence the update delivery path can substitute a tampered update payload. If the payload is executed or installed by the updater, this may result in arbitrary code execution in the context of the updating process or user.

State
PUBLISHED
Published
Mar 30, 2026
Updated
Apr 3, 2026
Evidence coverage
92%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateSource date omittedFirst observed by CASCA
    checkpoint

    Record text: TrueConf Client Update Integrity Verification Bypass

    Inspect raw assertion
    Field
    container
    Value
    TrueConf Client Update Integrity Verification Bypass
    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 dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: TrueConf Client Download of Code Without Integrity Check Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    TrueConf Client Download of Code Without Integrity Check Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 5.75% probability · 92.51th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.057460000000; percentile 0.925070000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Apr 2, 2026 · first observed Jul 19, 2026

Exploit likelihood5.75%

FIRST EPSS · score date Aug 27, 2026 · 92.5th percentile · first observed Aug 27, 2026

SeverityCVSS 7.8

checkpoint · CVSS 3.1 · first observed Jul 19, 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

checkpointOriginal assertion
Record text

TrueConf Client Update Integrity Verification Bypass

Inspect raw assertion
Field
container
Value
TrueConf Client Update Integrity Verification Bypass
Source dateSource date omittedFirst 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 ↗
CISA KEVOriginal assertion
Exploitation cataloged

TrueConf Client Download of Code Without Integrity Check Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
TrueConf Client Download of Code Without Integrity Check Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

5.75% probability · 92.51th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.057460000000; percentile 0.925070000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
1Underlying assertions
1Canonical products
1Target 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

checkpoint · source assertedTrueConfTrueConf ClientDirect source scope
Affected: TrueConf Client versions 8.1.0 through 8.5.2
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "TrueConf Client versions 8.1.0 through 8.5.2"}]
NVD CPE · APPLICATIONtrueconftrueconfVulnerable target · 1 assertions
Any version (unconstrained) (< 8.5.3.884)Canonical identity product-bb4336120e8193f25f5c191036a2390e0f4fef632094f95c43314bcf8e1be63dLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:trueconf:trueconf:*:*:*:*:*:windows:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 8.5.3.884
    Match ID
    c61e9be0-ced2-4518-933b-7538a4e8f890

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-979a95c28ff33c8fee2e4bec9ceebb439756134d4dec44c977e1df77fb3a4d3b · product-bb4336120e8193f25f5c191036a2390e0f4fef632094f95c43314bcf8e1be63d

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
65d91750-5809-4a0a-86de-36b6f49602db
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
d2fe1010-12a9-45ba-aa4e-3db81158fca4

Assessments

CVSS by origin

7.8
cve@checkpoint.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
7.8
checkpointCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L

Direct CVE/CNA normalized decisions

7.8Priority eligible

checkpoint

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Validation
Valid match
Recomputed
7.8
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.