CVE-2026-3502 | TrueConf Client Update Integrity Verification Bypass

Exp

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.

Published: 2026-03-30 Last update: 2026-04-03 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-3502 is rated Critical Active Threat (86.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.14%). CISA KEV confirms active exploitation (added 2026-04-02) affecting TrueConf / Client. a weakness (CWE-494) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2026-3502

Name: TrueConf Client Download of Code Without Integrity Check Vulnerability · CISA KEV detail

Exploit added: 2026-04-02

Action due: 2026-04-16

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.

Exploit prediction scoring system (EPSS) score for CVE-2026-3502

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-08 3.27% 3.14% -0.13%
2 2026-06-06 2.85% 3.27% +0.42%
3 2026-06-04 — 2.85% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-3502

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.2 6.0 [email protected]

Weakness enumeration for CVE-2026-3502

Affected software / configurations for CVE-2026-3502

Vendor Product Version Raw CPE
trueconf trueconf < 8.5.3.884 cpe:2.3:a:trueconf:trueconf:*:*:*:*:*:windows:*:*

References for CVE-2026-3502

cvelogic Threat Intelligence