CVE-2025-13821
6 advisories.
Go/github.com/mattermost/mattermost/server/v8 CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251210191531-cd17b61de41b or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20251210191531-cd17b61de41bAffected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20251210191531-cd17b61de41b | - |
Fixed versions
| 8.0.0-20251210191531-cd17b61de41b |
Sources
- osv: GHSA-pp9j-pf5c-659x
- https://nvd.nist.gov/vuln/detail/CVE-2025-13821
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages
Action: Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20251210191531-cd17b61de41b or later.
go get github.com/mattermost/mattermost-server@v5.3.2-0.20251210191531-cd17b61de41bAffected
| introduced | fixed | last affected |
|---|---|---|
| 11.1.0 | - | - |
| 10.11.0 | - | - |
| 11.2.0 | - | - |
| 0 | 5.3.2-0.20251210191531-cd17b61de41b | - |
Fixed versions
| 5.3.2-0.20251210191531-cd17b61de41b |
Sources
- osv: GHSA-pp9j-pf5c-659x#Go/github.com/mattermost/mattermost-server
- https://nvd.nist.gov/vuln/detail/CVE-2025-13821
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | - |
| 10.11.0+incompatible | - | - |
| 11.1.0+incompatible | - | - |
| 11.2.0+incompatible | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-4524
- nvd: CVE-2025-13821
- https://github.com/advisories/GHSA-pp9j-pf5c-659x
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v5 CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-4524#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2025-13821
- https://github.com/advisories/GHSA-pp9j-pf5c-659x
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v6 CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-4524#Go/github.com/mattermost/mattermost-server/v6
- nvd: CVE-2025-13821
- https://github.com/advisories/GHSA-pp9j-pf5c-659x
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2025-13821: medium 5.7, EPSS 0.24%
Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251210191531-cd17b61de41b or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20251210191531-cd17b61de41bAffected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20251210191531-cd17b61de41b | - |
Fixed versions
| 8.0.0-20251210191531-cd17b61de41b |
Sources
- osv: GO-2026-4524#Go/github.com/mattermost/mattermost/server/v8
- nvd: CVE-2025-13821
- https://github.com/advisories/GHSA-pp9j-pf5c-659x
- https://github.com/mattermost/mattermost/commit/cd17b61de41bf0a49b524bb91ce0bbe859e5a100
- https://mattermost.com/security-updates
CVE-2025-13821 · published · modified · JSON