CVE-2025-53971

lowpriority · track · 0OT risk · elevatedEPSS 0.002 · 10 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.20% (10th) EPSS

CVSS 3.8 · low

Is it mine?

34 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

cvss

Technical severity, 0–10. One row per scoring source.

3.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.13.8lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.13.8lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 1.2 · impact 2.5

v3.13.8lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:Nsecondary · OSV

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USCWE-863US

affected products (34)

Products and version ranges known to be affected.

Mattermost Mattermost Plugins <10.5.9all versionscert_bundDE
Mattermost Mattermost Server <10.10.0all versionscert_bundDE
Mattermost Mattermost Server <10.10.1all versionscert_bundDE
Mattermost Mattermost Server <10.11.0all versionscert_bundDE
Mattermost Mattermost Server <10.5.9all versionscert_bundDE
Mattermost Mattermost Server <10.8.4all versionscert_bundDE
Mattermost Mattermost Server <10.9.2all versionscert_bundDE
Mattermost Mattermost Server <10.9.3all versionscert_bundDE
Mattermost Mattermost Server <10.9.4all versionscert_bundDE
Mattermost Mattermost Server <9.11.18all versionscert_bundDE
Mattermost Mattermost≤ Server <9.11.18cert_bundDE
Mattermost Mattermost≤ Plugins <10.5.9cert_bundDE
Mattermost Mattermost≤ Server <10.10.0cert_bundDE
Mattermost Mattermost≤ Server <10.10.1cert_bundDE
Mattermost Mattermost≤ Server <10.11.0cert_bundDE
Mattermost Mattermost≤ Server <10.5.9cert_bundDE
Mattermost Mattermost≤ Server <10.8.4cert_bundDE
Mattermost Mattermost≤ Server <10.9.2cert_bundDE
Mattermost Mattermost≤ Server <10.9.3cert_bundDE
Mattermost Mattermost≤ Server <10.9.4cert_bundDE

showing 20 of 34

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1625Mattermost Server und Plugins: Mehrere SchwachstellenDeutsch2025-07-22csaf · cert_bundDE
Ein authentifizierter Angreifer mit bestimmten Berechtigungen kann diese Schwachstellen ausnutzen, um Sicherheitsmechanismen zu umgehen, beliebige Dateien in das Dateisystem einzubringen und potenziell beliebigen Code auszuführen.
GHSA-4276-cm8c-788hMattermost Fails to Properly Validate Team Role Modification2025-08-21ghsa · osvUS
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.
GO-2025-3902Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server2025-08-29vendor · osvUS
Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund NVD CVE.org MITRE

published 2025-08-21modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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