CVEs / CVE-2026-3502
CVE-2026-3502: TrueConf Client Download of Code Without Integrity Check Vulnerability
- Known exploited in the CISA KEV catalog since 2 Apr 2026
- high 7.8 CVSS 3.1 (from the CNA)
- EPSS 5.84% chance of exploitation in the next 30 days, higher than 93% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| TrueConf TrueConf Client | TrueConf Client versions 8.1.0 through 8.5.2 | — |
Exploitation
| In CISA KEV since | 2 Apr 2026 |
|---|---|
| Due date for US federal agencies | 16 Apr 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 7.8 highCVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:LScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-494 |
References
- CVE-2026-3502 on NVD
- CVE-2026-3502 in the CISA KEV catalog
- https://trueconf.com/blog/update/trueconf-8-5 (cited by CISA)
- https://trueconf.com/downloads/windows.html (cited by CISA)
- https://trueconf.com/blog/update/trueconf-8-5 Product, Release Notes
- https://research.checkpoint.com/2026/operation-truechaos-0-day-exploitation-against-southeast-asian-government-targets/ Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3502 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.