CVE-2026-3502: in the CISA KEV catalogue

TrueConf Client Download of Code Without Integrity Check Vulnerability. CISA added CVE-2026-3502 to the Known Exploited Vulnerabilities catalogue on 2026-04-02 with a default due date of 2026-04-16. Known ransomware campaign use: Unknown. Forensic triage flag: No.

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. (CISA description)

Vendor / product: TrueConf Client
CWE: CWE-494
CISA 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.
EPSS: 5.8%, percentile 93 (scored 2026-11-04)

EPSS puts about 5.8 in 100 odds (5.8%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 93% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.04, released 2026-11-04, 1,768 entries (checked 2026-11-05). EPSS model v2026.06.15, scored 2026-11-04, 400,189 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2026-3502 in the CISA KEV catalogue?

Yes. CISA added CVE-2026-3502 (TrueConf Client Download of Code Without Integrity Check Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2026-04-02. CISA's default due date for it is 2026-04-16.

Is CVE-2026-3502 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2026-3502. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2026-3502?

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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2026-3502