CVE-2025-27936
Medium
Description
Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Mattermost Server
PublishedApr 16, 2025
First seenApr 16, 2025
Weakness typeCWE-208CWE-208
How to fix
Update
- mattermost mattermost_server10.5.2 or later
- mattermost ms_teams2.1.0 or later
- github.com/mattermost/mattermost/server/v810.5.2, 8.0.0-20250314142426-c049748b8863, 8.0.0-20250218121836-2b5275d87136 or later
- github.com/mattermost/mattermost-plugin-msteams2.1.0 or later
- github.com/mattermost/mattermost-server10.5.2+incompatible or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | v < 10.5.2 | 10.5.2 |
| mattermost ms_teams | v < 2.1.0 | 2.1.0 |
| github.com/mattermost/mattermost/server/v8Go | 10.5.0 ≤ v < 10.5.2, v < 8.0.0-20250314142426-c049748b8863, v < 8.0.0-20250218121836-2b5275d87136 | 10.5.2, 8.0.0-20250314142426-c049748b8863, 8.0.0-20250218121836-2b5275d87136 |
| github.com/mattermost/mattermost-plugin-msteamsGo | v < 2.1.0, No range specified | 2.1.0 |
| github.com/mattermost/mattermost-serverGo | 10.5.0+incompatible ≤ v < 10.5.2+incompatible | 10.5.2+incompatible |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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