HIGHCVSS v3.1 8.0Vulnerability
CVE-2026-93851
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
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-10-28T23:43:43.157973+00:00
- Cvss severity
- HIGH
- Cvss score
- 8
- Retrieved at
- 2026-10-28T23:44:40+00:00
- Score
- 8
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-93851
- Cvss vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- First seen by Signal
- 2026-10-28T23:44:40+00:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- Published at
- 2026-10-28T22:17:17.310
- Last modified
- 2026-10-28T22:17:17.310
Related Entities (1)
HAS_WEAKNESS (1)
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