Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-3502

TrueConf Client Update Integrity Verification Bypass

TrueConf Client · TrueConf Client versions 8.1.0 through 8.5.2

Watch CVE-2026-3502 Browse KEV feed
Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
0.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-3502 is TrueConf Client Update Integrity Verification Bypass. TrueConf Client downloads application update code and applies it without performing verification. An attacker who is able to influence the update...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

TrueConf Client trueconf client versions 8.1.0 through 8.5.2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

TrueConf Client downloads application update code and applies it without performing verification

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.

TrueConf Affected
TrueConf Client
TrueConf Client versions 8.1.0 through 8.5.2
Published
30 Mar 2026
Exploitation Reported
01 Jun 2026
Attack vector
Adjacent
Complexity
Low
Privileges
High
User interaction
Required

Tags

cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CVE First 2026-06-01 12:42 UTC
CISA 2026-06-02 14:02 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L

EPSS

0.3%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Download of Code Without Integrity Check CWE-494

Timeline

From disclosure to observed exploitation

  1. 14:02 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. 12:42 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  3. 18:05 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 21:18 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-3502

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-3502",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.00329,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}