GHSA-m2w9-h2mm-79qrPublished

Mattermost: Delegated admins could patch protected default system roles

Exploitation and risk

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cve-program · CVE-2026-6739

Published

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656

Source published: 12 Jun 2026 15:49:14 UTC
Source modified: 13 Jun 2026 03:56:06 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 6.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

euvd · EUVD-2026-36499

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 12, 2026, 3:49:14 PM

dateUpdated: Jun 13, 2026, 3:56:06 AM

1 related source bulletins · separate from aliases

WID-SEC-W-2026-1529: Mattermost Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

CVE-2026-3433 · CVE-2026-6046 · CVE-2026-6689 · CVE-2026-6739 · CVE-2026-6961 · CVE-2026-7387

Source published: Jun 12, 2026, 3:49:14 PM (timezone not stated)
Source modified: Jun 13, 2026, 3:56:06 AM (timezone not stated)
Saved here: 15 Nov 2026 17:44:11 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 6.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

nvd · CVE-2026-6739

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-863

Original publisher date fields

published: 2026-06-12T17:16:27.290

lastModified: 2026-06-18T14:35:51.673

1 source CPE criteria · context only

cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 12 Jun 2026 17:16:27 UTC
Source modified: 18 Jun 2026 14:35:51 UTC
Saved here: 25 Oct 2026 15:18:51 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 6.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

CVSS 3.1 · [email protected] · Primary · 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

osv · GHSA-m2w9-h2mm-79qr

Published

Source published: 12 Jun 2026 18:31:59 UTC
Source modified: 10 Sep 2026 03:51:08 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

Publisher rating · MODERATE

osv · GO-2026-6285

Published

Mattermost doesn't require system-level permission when patching protected default system roles in github.com/mattermost/mattermost-server

Source published: 25 Aug 2026 19:43:10 UTC
Source modified: 26 Aug 2026 01:13:02 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.