CVE-2026-82920
Last modified
CVE-2026-82920 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/access_control_policies request with an empty imports list.. Mattermost Advisory ID: MMSA-2026-00724. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7 fail to enforce authorization boundaries on the access control policy update endpoint which allows a channel or team administrator to detach a system-assigned ABAC parent policy via a crafted PUT /api/v4/access_control_policies request with an empty imports list.. Mattermost Advisory ID: MMSA-2026-00724
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | >= 11.9.0, <= 11.9.0; >= 11.8.0, <= 11.8.4; >= 11.7.0, <= 11.7.7 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-82920?
How severe is CVE-2026-82920?
How do I fix CVE-2026-82920?
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-8291A weakness has been identified in Open5GS up to 2.7.7. Impac…6.5
- CVE-2026-82911Cross-Site Request Forgery (CSRF) in the OrderConfirmControl…5.1
- CVE-2026-82914A security flaw has been discovered in kishan0725 Hospital-M…7.3
- CVE-2026-82918XG VisionTerminal and XG-X VisionTerminal provided by Keyenc…5.5
- CVE-2026-82919A vulnerability was identified in cu silicon up to 0.1.5. Af…7.3
- CVE-2026-8292A security vulnerability has been detected in Open5GS up to …6.5
- CVE-2026-82921A weakness has been identified in ShopEx ECShop up to 2.5.1.…7.3
- CVE-2026-82922A security vulnerability has been detected in ShopEx ECShop …7.3
- CVE-2026-82923The AI Website Builder WordPress plugin (GitHub build) 1.0.0…9.8
- CVE-2026-82925The Site Reviews WordPress plugin before 8.3.0 does not prev…8.1
- CVE-2026-82926NULL pointer dereference vulnerability in Samsung Open Sourc…5.5
- CVE-2026-82927Untrusted pointer dereference vulnerability in Samsung Open …5.5
Are you affected by CVE-2026-82920?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST