CVE-2025-13767

mediumpriority · track · 0OT risk · elevatedEPSS 0.002 · 9 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.19% (9th) EPSS

CVSS 4.3 · medium

Is it mine?

30 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do 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

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:N/AC:L/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-863USCWE-863US

affected products (30)

Products and version ranges known to be affected.

Mattermost Mattermost Server <10.11.8all versionscert_bundDE
Mattermost Mattermost Server <10.12.4all versionscert_bundDE
Mattermost Mattermost Server <11.0.6all versionscert_bundDE
Mattermost Mattermost Server <11.1.1all versionscert_bundDE
Mattermost Mattermost Server <11.2.0all versionscert_bundDE
Mattermost Mattermost≤ Server <11.0.6cert_bundDE
Mattermost Mattermost≤ Server <10.11.8cert_bundDE
Mattermost Mattermost≤ Server <10.12.4cert_bundDE
Mattermost Mattermost≤ Server <11.1.1cert_bundDE
Mattermost Mattermost≤ Server <11.2.0cert_bundDE
Mattermost Mattermost≤ 10.12.0 ≤10.12.3enisa_euvdEU
Mattermost Mattermost≤ 10.11.0 ≤10.11.7enisa_euvdEU
Mattermost Mattermost≤ 11.0.0 ≤11.0.5enisa_euvdEU
Mattermost Mattermost≤ 11.1.0 ≤11.1.0enisa_euvdEU
mattermost mattermost server10.11.0 → 10.11.8nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server10.12.0 → 10.12.4nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.0.0 → 11.0.6nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.1.0 → 11.1.1nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-server10.11.0 → 10.11.8osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server10.11.0+incompatible → 10.11.8+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server

showing 20 of 30

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2712Mattermost: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2025-12-01csaf · cert_bundDE
Ein Angreifer kann eine Schwachstelle in Mattermost ausnutzen, um Informationen offenzulegen.
GHSA-fmqf-pmcm-8cx9Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues2025-12-24ghsa · osvUS
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to.
GO-2025-4259Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server2026-02-26vendor · osvUS
Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.0.0-20251121122154-b57c297c6d7.

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 2025-12-24modified 2026-10-19

references (5)

External citations — patches, advisories, analysis.

scry

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