CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2025-27936
Medium (5.9) in mattermost. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 10.5.2, 8.0.0-20250218121836-2b5275d87136, 8.0.0-20250314142426-c049748b8863.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-31)
- CWE
- CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
- mattermost:ms_teams
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-2j87-p623-8cc2 | Go | github.com/mattermost/mattermost/server/v8 | >=10.5.0 <10.5.2 | 10.5.2 |
| GHSA-2j87-p623-8cc2 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250314142426-c049748b8863 | 8.0.0-20250314142426-c049748b8863 |
| GHSA-2j87-p623-8cc2 | Go | github.com/mattermost/mattermost-plugin-msteams | <2.1.0 | 2.1.0 |
| GO-2025-3618 | Go | github.com/mattermost/mattermost-plugin-msteams | all versions | no fix published |
| GO-2025-3618 | Go | github.com/mattermost/mattermost-server | >=10.5.0+incompatible <10.5.2+incompatible | 10.5.2+incompatible |
| GO-2025-3618 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-3618 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-3618 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250218121836-2b5275d87136 | 8.0.0-20250218121836-2b5275d87136 |