High severity8.0NVD Advisory· Published Oct 28, 2026
CVE-2026-93851
CVE-2026-93851
Description
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to validate the target post ID in the Agents plugin's mention reminder component, which allows an authenticated user who can post in a channel visible to a system administrator to cause the administrator's browser to send an unintended API request, resulting in replacement of an installed plugin and code execution on the server, via a crafted post containing a forged mention reminder that the administrator clicks. Mattermost Advisory ID: MMSA-2026-00742
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <=11.9.1, <=11.8.5, <=11.7.10
- Range: <=11.9.1, <=11.8.5, <=11.7.10
Patches
Vulnerability mechanics
References
1News mentions
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