CVE-2025-27936
MEDIUM5.3EPSS 0.24%Mattermost vulnerable to Observable Timing Discrepancy
Published: 4/16/2025Modified: 2/4/2026
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.
Affected packages (7)
- Go/github.com/mattermost/mattermost-plugin-msteamsfrom 0, < 2.1.0
- Go/github.com/mattermost/mattermost-plugin-msteamsfrom 0
- Go/github.com/mattermost/mattermost-server>= 10.5.0+incompatible, < 10.5.2+incompatible
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20250218121836-2b5275d87136
- Go/github.com/mattermost/mattermost/server/v8>= 10.5.0, < 10.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |