---
title: "CVE-2026-3502: TrueConf Client Download of Code Without Integrity Check Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-3502/
description: "CVE-2026-3502 (TrueConf Client): Exploited in the wild (CISA KEV). TrueConf Client downloads application update code and applies it without performing…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-30
date_modified: 2026-04-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-3502"
kev: true
cvss: 7.8
epss: 0.00329
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-3502: TrueConf Client Download of Code Without Integrity Check Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run TrueConf Client. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-02, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-04-16 ; treat that as the outer limit, not the target.
- EPSS 0.3% , percentile 25: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 25% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.

## What it is

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 products (CVE record)

- TrueConf TrueConf Client: TrueConf Client versions 8.1.0 through 8.5.2

## Severity

- checkpoint CVSS 3.1: 7.8 `CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L`

## Exploitation

- CISA KEV: added 2026-04-02; federal due date 2026-04-16. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.33% probability of exploitation activity in the next 30 days; percentile 25.

## Sources

- [Listed in CISA KEV notes (trueconf.com)](https://trueconf.com/blog/update/trueconf-8-5)
- [Listed in CISA KEV notes (trueconf.com)](https://trueconf.com/downloads/windows.html)
- [CVE.org record CVE-2026-3502](https://www.cve.org/CVERecord?id=CVE-2026-3502)
- [NVD entry CVE-2026-3502](https://nvd.nist.gov/vuln/detail/CVE-2026-3502)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3502)
- [research.checkpoint.com](https://research.checkpoint.com/2026/operation-truechaos-0-day-exploitation-against-southeast-asian-government-targets/)

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Source page: https://erroneo.us/security/cve/CVE-2026-3502/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt