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CVE-2026-93851high8.0

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

Impact

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 excerpt · Mattermost

What to do

Update Mattermost to versions 11.10.0, 11.9.2, 11.8.6, 11.7.11 or higher.

Mattermost guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Mattermost · Mattermost

Other versions: unaffected

Version / rangeSource status
11.9.0 through 11.9.1 (inclusive)affected
11.8.0 through 11.8.5 (inclusive)affected
11.7.0 through 11.7.10 (inclusive)affected
11.10.0unaffected
11.9.2unaffected
11.8.6unaffected
11.7.11unaffected
Mattermost version evidence

Original source 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

References