CVE-2025-20086
MEDIUMCVSS 6.5/10EPSS 0.41%
Last modified
CVE-2025-20086 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
Description
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost Server | >= 9.11.0, < 9.11.6 |
| Mattermost | Mattermost Server | >= 10.0.0, < 10.0.4 |
| Mattermost | Mattermost Server | >= 10.1.0, < 10.1.4 |
| Mattermost | Mattermost Server | 10.2.0 |
References
- https://mattermost.com/security-updatesVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-20086?
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
How severe is CVE-2025-20086?
CVE-2025-20086 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.
How do I fix CVE-2025-20086?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- 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 2025
- CVE-2025-20080Null pointer dereference in the firmware for some Intel(R) A…8.2
- CVE-2025-20081in OpenHarmony v5.0.2 and prior versions allow a local attac…5.3
- CVE-2025-20082Time-of-check time-of-use race condition in the UEFI firmwar…8.7
- CVE-2025-20083Improper authentication in the firmware for the Intel(R) Sli…7.5
- CVE-2025-20084Uncontrolled resource consumption for some Edge Orchestrator…5.1
- CVE-2025-20085A denial of service vulnerability exists in the Modbus RTU o…6.5
- CVE-2025-20087Incorrect default permissions for some Intel(R) oneAPI DPC++…6.7
- CVE-2025-20088Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0…6.5
- CVE-2025-20089Rejected reason: This CVE ID has been rejected or withdrawn …
- CVE-2025-2009The Newsletters plugin for WordPress is vulnerable to Stored…7.2
- CVE-2025-20090Untrusted Pointer Dereference for some Intel(R) QuickAssist …6.8
- CVE-2025-20091in OpenHarmony v5.0.2 and prior versions allow a local attac…7.8
Are you affected by CVE-2025-20086?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST