PatchSiren cyber security CVE debrief

CVE-2026-8381 TeamViewer CVE debrief

A broken access control vulnerability exists in the TeamViewer DEX Platform (On-Premises) prior to version 9.2. Certain backend API endpoints do not correctly enforce authorization checks, allowing an authenticated user with low privileges to perform actions and access resources intended only for higher-privileged roles. This vulnerability allows an attacker with low-privileged credentials to gain unauthorized access to administrative or sensitive functionality. The vulnerability has a CVSS score of 5.4 and a severity of MEDIUM. Organizations using TeamViewer DEX Platform (On-Premises) prior to version 9.2 should assess their exposure and apply the patch.

Vendor: TeamViewer
Product: DEX (On-premises)
CVSS: MEDIUM 5.4
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-22
Original CVE updated: 2026-07-23
Advisory published: 2026-05-22
Advisory updated: 2026-07-23

Who should care

Organizations using TeamViewer DEX Platform (On-Premises) prior to version 9.2 should assess their exposure and apply the patch. Security teams and administrators responsible for managing TeamViewer DEX Platform (On-Premises) instances should review and adjust access controls and authorization checks. They should also monitor for suspicious activity and implement compensating controls.

Technical summary

The TeamViewer DEX Platform (On-Premises) prior to version 9.2 has a broken access control vulnerability. This vulnerability allows an authenticated user with low privileges to perform actions and access resources intended only for higher-privileged roles due to certain backend API endpoints not correctly enforcing authorization checks. The vulnerability has a CVSS score of 5.4 and a severity of MEDIUM. The CVE record was published on 2026-05-22T09:16:32.743Z and was last modified on 2026-07-23T16:10:00.137Z.

Defensive priority

Medium

Recommended defensive actions

Inventory and assess exposure of TeamViewer DEX Platform (On-Premises) instances
Apply the patch to upgrade to version 9.2 or later
Monitor for suspicious activity and implement compensating controls
Review and adjust access controls and authorization checks
Verify and validate user privileges and roles
Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record was published on 2026-05-22T09:16:32.743Z and was last modified on 2026-07-23T16:10:00.137Z. The NVD entry is currently Awaiting Analysis. TeamViewer DEX Platform (On-Premises) versions prior to 9.2 are affected by a broken access control vulnerability. Certain backend API endpoints do not correctly enforce authorization checks, allowing an authenticated user with low privileges to perform actions and access resources intended only for higher-privileged roles. The vulnerability allows an attacker with low-privileged credentials to gain unauthorized access to administrative or sensitive functionality. Evidence is limited to CVE and NVD information.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-05-22T09:16:32.743Z and has not been modified since then. The NVD entry is currently Awaiting Analysis.