CVE-2026-10106
Medium
Description
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mattermost Server
PublishedJul 13, 2026
First seenJul 13, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- mattermost mattermost_server10.11.20, 11.6.5, 11.7.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.11.0 ≤ v < 10.11.20, 11.6.0 ≤ v < 11.6.5, 11.7.0 ≤ v < 11.7.3 | 10.11.20, 11.6.5, 11.7.3 |
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