What’s Vulnerable › Vulnerabilities
CVE-2025-49810: Thread summarization allows persistent access to channel
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-08-21 · updated 2026-06-17
- Weakness: CWE-863
Description
Mattermost versions 10.5.x <= 10.5.8 fail to validate access controls at time of access which allows user to read a thread via AI posts
Affected products
- Mattermost: from 10.5.0 before 10.5.9 — fixed in 10.5.9
How to fix
Upgrade to a fixed version: Mattermost 10.5.9. Check the vendor advisory for mitigations.
References
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