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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2026-3502 — Trueconf

HIGH

CVE-2026-3502 is a high-severity (CVSS 7.8) CWE-494 vulnerability in trueconf trueconf. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-04-02) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-04-02. Federal agencies were required to remediate by 2026-04-16.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-3502.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs25th percentile — riskier than 25% of all scored CVEsHighest risk
0.00%2.49%4.98%7.47%0.0%0.3%Apr 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-3502 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

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.

Affected Products

1 product · 1 configurations
Application
trueconftrueconf
< 8.5.3.884
range

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every trueconf trueconf deployment and check each version against the affected-products list above.

  2. Fix

    Apply the trueconf trueconf security patch or hotfix for CVE-2026-3502 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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.
O3 Security · Runtime Protection

Is CVE-2026-3502 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
Actively Exploited: CVE-2026-3502: Trueconf (High 7.8)