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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.5.0 – ≤ 10.5.1 | 10.6.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250422T181640-1.1 | openSUSE-SU-2025:15017-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-msteams | < 2.1.0 | 2.1.0 | GHSA-2j87-p623-8cc2 |
| Go | github.com/mattermost/mattermost-plugin-msteams | all versions | — | 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 | — | GO-2025-3618 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3618 |
| 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/server/v8 | < 8.0.0-20250218121836-2b5275d87136 | 8.0.0-20250218121836-2b5275d87136 | GO-2025-3618 |
Advisories 2
- openSUSE-SU-2025:15017-1 govulncheck-vulndb-0.0.20250422T181640-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0578 Mattermost Plugins: Schwachstelle ermöglicht Offenlegung von Daten BSI CERT-Bund (WID) · Apr 16, 2025