Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6739: medium 6.7, EPSS 0.26%

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@v8.0.0-20260501142004-99b73d4c4acf

Affected

Fixed versions

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 2026-06-12T18:31:59Z · modified 2026-09-10T03:51:08.919891159Z · JSON