CVE-2026-27659
5 advisories.
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-27659: medium 4.6
Mattermost doesn't properly validate CSRF tokens
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 10.11.11 or later.
go get github.com/mattermost/mattermost/server/v8@v11.4.1go get github.com/mattermost/mattermost/server/v8@v11.3.2go get github.com/mattermost/mattermost/server/v8@v11.2.3go get github.com/mattermost/mattermost/server/v8@v10.11.11Affected
| introduced | fixed | last affected |
|---|---|---|
| 11.4.0-rc1 | 11.4.1 | - |
| 11.3.0-rc1 | 11.3.2 | - |
| 11.2.0-rc1 | 11.2.3 | - |
| 10.11.0-rc1 | 10.11.11 | - |
| 8.0.0-20260105080200-d27a2195068d | 10.11.11 | - |
Fixed versions
| 11.4.1 | 11.3.2 | 11.2.3 | 10.11.11 |
Sources
- osv: GHSA-rmhw-c3xr-m3xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-27659
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2026-27659: unknown
Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.11+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.11+incompatiblego get github.com/mattermost/mattermost-server@v11.2.3+incompatiblego get github.com/mattermost/mattermost-server@v11.3.2+incompatiblego get github.com/mattermost/mattermost-server@v11.4.1+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0-rc1+incompatible | 10.11.11+incompatible | - |
| 11.2.0-rc1+incompatible | 11.2.3+incompatible | - |
| 11.3.0-rc1+incompatible | 11.3.2+incompatible | - |
| 11.4.0-rc1+incompatible | 11.4.1+incompatible | - |
Fixed versions
| 10.11.11+incompatible | 11.2.3+incompatible | 11.3.2+incompatible | 11.4.1+incompatible |
Sources
- osv: GO-2026-5629
- https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-27659
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v5 CVE-2026-27659: unknown
Mattermost doesn't properly validate CSRF tokens 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-2026-5629#Go/github.com/mattermost/mattermost-server/v5
- https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-27659
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v6 CVE-2026-27659: unknown
Mattermost doesn't properly validate CSRF tokens 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-2026-5629#Go/github.com/mattermost/mattermost-server/v6
- https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-27659
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-27659: unknown
Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 8.0.0-20260105080200-d27a2195068d | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-5629#Go/github.com/mattermost/mattermost/server/v8
- https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-27659
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON