CVE-2026-3502

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.

Overview

State: PUBLISHED
Assigner (CNA): checkpoint
CVSS severity: HIGH
CVSS score: 7.8 / 10
CVSS vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Effective score: 7.8 / 10 HIGH source: CNA overview
CWE(s): CWE-494
Reserved: 2026-03-03
Published: 2026-03-30 18:05 UTC
Last updated: 2026-04-03 03:55 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3502.json
Linked Threat: CVE-2026-3502 — TrueConf Client: TrueConf Client Download of Code Without Integrity Check Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: TrueConf Client Download of Code Without Integrity Check Vulnerability
Vendor / project: TrueConf
Product: Client
Date added to KEV: 2026-04-02
Remediation 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.
Ransomware campaign use: Unknown
CISA notes: https://trueconf.com/blog/update/trueconf-8-5 ; https://trueconf.com/downloads/windows.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-3502
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-03-30 19:16:27 UTC
NVD last modified: 2026-04-03 11:40:57 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: cve@checkpoint.com
NVD CVSS vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
Exploitability subscore: 1.2 / 10
Impact subscore: 6.0 / 10
EPSS score: 0.0240 (probability of exploitation in next 30 days)
EPSS percentile: 85.25% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-17162
Assigner: checkpoint
Published: Mar 30, 2026, 6:05:42 PM
Updated: Apr 3, 2026, 3:55:23 AM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
EUVD-reported EPSS: 2.5600
Vendors: TrueConf
Products: TrueConf Client (TrueConf Client versions 8.1.0 through 8.5.2)

ENISA 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.

EUVD references (1)

https://trueconf.com/blog/update/trueconf-8-5

Affected products (1)

Vendor	Product	Versions	Platforms
TrueConf	TrueConf Client	`TrueConf Client versions 8.1.0 through 8.5.2` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:trueconf:trueconf:*:*:*:*:*:windows:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://trueconf.com/blog/update/trueconf-8-5

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://trueconf.com/blog/update/trueconf-8-5

Web references (5)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://cwe.mitre.org/data/definitions/494.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-3502 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/enisa/EUVD-2026-17162 rapid7:euvd.enisa.europa.eu
https://nvd.nist.gov/vuln/detail/CVE-2026-3502 rapid7:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-3502 rapid7:www.cve.org

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://research.checkpoint.com/2026/operation-truechaos-0-day-exploitation-against-southeast-asian-government-targets/ 134c704f-9b21-4f2e-91b3-4a467353bcc0 Third Party Advisory
https://trueconf.com/blog/update/trueconf-8-5 cve@checkpoint.com ProductRelease Notes
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3502 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cve	`CVE-2026-3502`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-494`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-14 11:16 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 11:16 UTC
138 CVEs Fixed: Netlogon RCE Leads Microsoft's Patch Pack - DNS Bug ...

web:vulert.com

Microsoft's May 2026 Patch Tuesday fixes 138 vulnerabilities, including critical Windows DNS and Netlogon RCE flaws. Learn the risks, key CVEs , mitigation steps, and how Vulert can help.

2026-05-14 11:16 UTC
Microsoft's May 2026 Patch Tuesday Fixes 130+ Vulnerabilities ...

web:windowsreport.com

Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]

2026-05-14 11:16 UTC
CISA Patch Mandate Guide: CVE-2026-3502 Compliance & CIRCIA ...

web:www.aigovhub.io

Step-by-step implementation guide for CISA's urgent patch mandates, including CVE-2026-3502 remediation by April 16, 2026 . Learn federal cybersecurity compliance workflows.

2026-05-14 11:16 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-05-14 11:16 UTC
May 2026 Patch Tuesday: no zero-days but plenty to fix

web:www.malwarebytes.com

May's Patch Tuesday may not be the giant release many expected, but there are still plenty of important fixes that shouldn't be ignored.

2026-05-14 11:16 UTC
120 Vulnerabilities Patched: Microsoft's May 2026 Patch Tuesday ...

web:www.secpod.com

The second Tuesday of May 2026 marked another major security update release from Microsoft, addressing a broad range of vulnerabilities across Windows, Microsoft Office, SharePoint, Dynamics 365, .NET, DNS Client, and other core enterprise components. While this month's Patch Tuesday did not include any actively exploited or publicly disclosed zero-day vulnerabilities, the release still ...

2026-05-14 11:16 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-04-16 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-3502.json.

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