CVE-2025-13870

mediumpriority · track · 17OT risk · elevatedEPSS 0.002 · 13 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.22% (13th) EPSS

CVSS 4.3 · medium

Is it mine?

19 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

cvss

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

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.1–4.3

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 1.6 · impact 1.4

v3.13.1lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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-284USCWE-306USCWE-306US

affected products (19)

Products and version ranges known to be affected.

Mattermost Mattermost Server <10.11.5all versionscert_bundDE
Mattermost Mattermost Server <10.5.13all versionscert_bundDE
Mattermost Mattermost Server <11.1.0all versionscert_bundDE
Mattermost Mattermost≤ Server <10.5.13cert_bundDE
Mattermost Mattermost≤ Server <10.11.5cert_bundDE
Mattermost Mattermost≤ Server <11.1.0cert_bundDE
Mattermost Mattermost≤ 10.11.0 ≤10.11.4enisa_euvdEU
Mattermost Mattermost≤ 10.5.0 ≤10.5.12enisa_euvdEU
mattermost mattermost server10.11.0 → 10.11.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server10.5.0 → 10.5.13nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost10.11.0 → 10.11.5osvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.11.0+incompatible → 10.11.5+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.5.0 → 10.5.13osvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.5.0+incompatible → 10.5.13+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost-serverall versionsosvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server/v5all versionsosvUSpkg:golang/github.com/mattermost/mattermost-server/v5
Go github.com/mattermost/mattermost-server/v6all versionsosvUSpkg:golang/github.com/mattermost/mattermost-server/v6
Go github.com/mattermost/mattermost/server/v8< 8.0.0-20250905150616-ba86dfc5876bosvUSpkg:golang/github.com/mattermost/mattermost/server/v8
Go github.com/mattermost/mattermost/server/v8< 8.0.0-20251212204551-54f2e9b4afd5osvUSpkg:golang/github.com/mattermost/mattermost/server/v8

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2715Mattermost Server: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2025-12-01csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Mattermost Server ausnutzen, um Informationen offenzulegen.
GHSA-58w6-w55x-6wq8Mattermost fails to validate user permissions in Boards2025-12-02ghsa · osvUS
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
GO-2025-4178Mattermost fails to validate user permissions in Boards in github.com/mattermost/mattermost2025-12-08vendor · osvUS
Mattermost fails to validate user permissions in Boards in github.com/mattermost/mattermost

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 NVD CVE.org MITRE

published 2025-12-02modified 2026-10-18

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan