CVE-2026-6739
6 advisories.
Go/github.com/mattermost/mattermost-server CVE-2026-6739: medium 6.7, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.17 or later.
go get github.com/mattermost/mattermost-server@v11.6.1go get github.com/mattermost/mattermost-server@v11.5.5go get github.com/mattermost/mattermost-server@v10.11.17Affected
| introduced | fixed | last affected |
|---|---|---|
| 11.6.0 | 11.6.1 | - |
| 11.5.0 | 11.5.5 | - |
| 10.11.0 | 10.11.17 | - |
Fixed versions
| 11.6.1 | 11.5.5 | 10.11.17 |
Sources
- osv: GHSA-m2w9-h2mm-79qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6739: medium 6.7, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260501142004-99b73d4c4acf or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260501142004-99b73d4c4acfAffected
| introduced | fixed | last affected |
|---|---|---|
| 8.0.0-20250731163400-5b955468ea1e | 8.0.0-20260501142004-99b73d4c4acf | - |
Fixed versions
| 8.0.0-20260501142004-99b73d4c4acf |
Sources
- osv: GHSA-m2w9-h2mm-79qr#Go/github.com/mattermost/mattermost/server/v8
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2026-6739: unknown, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.17+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.17+incompatiblego get github.com/mattermost/mattermost-server@v11.5.5+incompatiblego get github.com/mattermost/mattermost-server@v11.6.1+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0+incompatible | 10.11.17+incompatible | - |
| 11.5.0+incompatible | 11.5.5+incompatible | - |
| 11.6.0+incompatible | 11.6.1+incompatible | - |
Fixed versions
| 10.11.17+incompatible | 11.5.5+incompatible | 11.6.1+incompatible |
Sources
- osv: GO-2026-6285
- https://github.com/advisories/GHSA-m2w9-h2mm-79qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v5 CVE-2026-6739: unknown, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles 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-2026-6285#Go/github.com/mattermost/mattermost-server/v5
- https://github.com/advisories/GHSA-m2w9-h2mm-79qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON
Go/github.com/mattermost/mattermost-server/v6 CVE-2026-6739: unknown, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles 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-2026-6285#Go/github.com/mattermost/mattermost-server/v6
- https://github.com/advisories/GHSA-m2w9-h2mm-79qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON
Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6739: unknown, EPSS 0.46%
Mattermost doesn't require system-level permission when patching protected default system roles in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260501142004-99b73d4c4acf or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260501142004-99b73d4c4acfAffected
| introduced | fixed | last affected |
|---|---|---|
| 8.0.0-20250731163400-5b955468ea1e | 8.0.0-20260501142004-99b73d4c4acf | - |
Fixed versions
| 8.0.0-20260501142004-99b73d4c4acf |
Sources
- osv: GO-2026-6285#Go/github.com/mattermost/mattermost/server/v8
- https://github.com/advisories/GHSA-m2w9-h2mm-79qr
- https://nvd.nist.gov/vuln/detail/CVE-2026-6739
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbae
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7
- https://github.com/mattermost/mattermost/pull/36197
- https://github.com/mattermost/mattermost/pull/36377
- https://github.com/mattermost/mattermost/pull/36379
- https://github.com/mattermost/mattermost/pull/36380
- https://github.com/mattermost/mattermost/pull/36382
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0
- https://mattermost.com/security-updates
CVE-2026-6739 · published · modified · JSON