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CVE-2026-93851Published

Path traversal in Mattermost Agents plugin mention reminder allows plugin replacement via crafted post

Exact source revision recorded 29 Oct 2026 17:12:12 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-93851

Published

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

Source published
28 Oct 2026 21:41:15 UTC
Source modified
29 Oct 2026 15:15:32 UTC
Observed here
29 Oct 2026 17:12:12 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 8.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

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Sources read 6 Nov 23:29 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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