CVE-2026-8823
6 advisories.
Go/github.com/mattermost/mattermost-server CVE-2026-8823: low 3.8, EPSS 0.32%
Mattermost has an Incorrect Authorization issue
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.18 or later.
go get github.com/mattermost/mattermost-server@v11.7.1go get github.com/mattermost/mattermost-server@v10.11.18Affected
| introduced | fixed | last affected |
|---|---|---|
| 11.7.0 | 11.7.1 | - |
| 10.11.0 | 10.11.18 | - |
Fixed versions
| 11.7.1 | 10.11.18 |
Sources
- osv: GHSA-xmfh-3ccg-c9fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-8823: low 3.8, EPSS 0.32%
Mattermost has an Incorrect Authorization issue
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260518160100-9bd77d3fc4d2 or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260518160100-9bd77d3fc4d2Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20260518160100-9bd77d3fc4d2 | - |
Fixed versions
| 8.0.0-20260518160100-9bd77d3fc4d2 |
Sources
- osv: GHSA-xmfh-3ccg-c9fx#Go/github.com/mattermost/mattermost/server/v8
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2026-8823: unknown, EPSS 0.32%
Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.18+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.18+incompatiblego get github.com/mattermost/mattermost-server@v11.7.1+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0+incompatible | 10.11.18+incompatible | - |
| 11.7.0+incompatible | 11.7.1+incompatible | - |
Fixed versions
| 10.11.18+incompatible | 11.7.1+incompatible |
Sources
- osv: GO-2026-6547
- https://github.com/advisories/GHSA-xmfh-3ccg-c9fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v5 CVE-2026-8823: unknown, EPSS 0.32%
Mattermost has an Incorrect Authorization issue 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-2026-6547#Go/github.com/mattermost/mattermost-server/v5
- https://github.com/advisories/GHSA-xmfh-3ccg-c9fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v6 CVE-2026-8823: unknown, EPSS 0.32%
Mattermost has an Incorrect Authorization issue 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-2026-6547#Go/github.com/mattermost/mattermost-server/v6
- https://github.com/advisories/GHSA-xmfh-3ccg-c9fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-8823: unknown, EPSS 0.32%
Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260518160100-9bd77d3fc4d2 or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260518160100-9bd77d3fc4d2Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20260518160100-9bd77d3fc4d2 | - |
Fixed versions
| 8.0.0-20260518160100-9bd77d3fc4d2 |
Sources
- osv: GO-2026-6547#Go/github.com/mattermost/mattermost/server/v8
- https://github.com/advisories/GHSA-xmfh-3ccg-c9fx
- https://nvd.nist.gov/vuln/detail/CVE-2026-8823
- https://docs.mattermost.com/security-guide/security-updates
- https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b
- https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1
- https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d
- https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6
- https://github.com/mattermost/mattermost/pull/36487
- https://github.com/mattermost/mattermost/releases/tag/v10.11.18
- https://github.com/mattermost/mattermost/releases/tag/v11.7.1
CVE-2026-8823 · published · modified · JSON