TrueConf Client Download of Code Without Integrity Check Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-04-02

[ Description ]Official 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.

CISA: TrueConf Client contains a download of code without integrity check vulnerability. 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 16 Apr 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• trueconf.com/blog/update/trueconf-8-5ProductRelease Notes
• research.checkpoint.com/2026/operation-truechaos-0-day-exploitation-against-southeast-a…Third Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource