CVE-2026-3502

TrueConf Client remote code execution, confirmed exploited in the wild.

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.

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5.8%chance of exploitation in the next 30 days (EPSS), 93rd percentile

2 Apradded to CISA's Known Exploited Vulnerabilities list, 2026

16 Aprfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	TrueConf Client Download of Code Without Integrity Check Vulnerability
Vendor and product	TrueConf · Client
Type	remote code execution · CWE-494
Exploited	Confirmed by CISA listed 2 April 2026
Likelihood	more likely to be exploited than most
Deadline	16 April 2026 · already passed
Used in ransomware	Not reported
Advisories	trueconf.com ↗ · trueconf.com ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Patch to the fixed version the vendor names, today if the product faces the internet.

Step 2

Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.

Step 3

Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

CISA's required action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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Questions

CVE-2026-3502 in short

Is CVE-2026-3502 being exploited?

Yes. CISA added CVE-2026-3502 to its Known Exploited Vulnerabilities catalogue on 2 April 2026, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2026-3502?

US federal agencies must remediate it by 16 April 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2026-3502 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 5.8%, the 93rd percentile of every CVE it scores.

How do I fix CVE-2026-3502?

Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.

Same vendor

Other TrueConf vulnerabilities being exploited

CVE	Product	Type	Listed
CVE-2026-72530	Server	remote code execution	20 August 2026
CVE-2026-72529	Server	authentication bypass	20 August 2026

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.