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HIGH · CVSS 7.8 CISA Known Exploited Vulnerability

CVE-2026-3502

TrueConf Client Download of Code Without Integrity Check Vulnerability

TrueConf Client

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.

CVSS
7.8
HIGH
EPSS
0.3%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
30 Mar 2026
CWE-494

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 2 April 2026. US federal agencies were required to remediate it by 16 April 2026.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 0.3%, which is higher than 24.3% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2026-3502 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2026-3502.

What does CVE-2026-3502 affect?

CVE-2026-3502 affects TrueConf Client. 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.

How severe is CVE-2026-3502?

CVE-2026-3502 is rated HIGH with a CVSS base score of 7.8. EPSS puts the probability of exploitation in the next 30 days at 0.3%, higher than 24.3% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 16 April 2026.

How should organisations respond to CVE-2026-3502?

Apply the vendor patch for TrueConf Client as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.