CVE-2025-12756

mediumpriority · track · 0OT risk · elevatedEPSS 0.002 · 8 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.18% (8th) EPSS

CVSS 4.3 · medium

Is it mine?

25 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.

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

v3.14.3mediumAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

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

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

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-863USCWE-863US

affected products (25)

Products and version ranges known to be affected.

Mattermost Mattermost≤ 10.11.0 ≤10.11.4enisa_euvdEU
Mattermost Mattermost≤ 11.0.0 ≤11.0.2enisa_euvdEU
Mattermost Mattermost≤ 10.12.0 ≤10.12.1enisa_euvdEU
Mattermost Mattermost≤ 10.5.0 ≤10.5.12enisa_euvdEU
Mattermost Inc Mattermost10.11.0 → 10.11.4fstec_bduRU
Mattermost Inc Mattermost10.12.0 → 10.12.1fstec_bduRU
Mattermost Inc Mattermost10.5.0 → 10.5.12fstec_bduRU
Mattermost Inc Mattermost11.0.0 → 11.0.2fstec_bduRU
mattermost mattermost server10.11.0 → 10.11.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server10.12.0 → 10.12.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server10.5.0 → 10.5.13nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.0.0 → 11.0.3nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermostall versionsosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.11.0 → 10.11.4osvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost≥ 10.11.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.12.0 → 10.12.1osvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost≥ 10.12.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost10.5.0 → 10.5.12osvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost≥ 10.5.0+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost
Go github.com/mattermost/mattermost11.0.0 → 11.0.2osvUSpkg:golang/github.com/mattermost/mattermost

showing 20 of 25

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-p6gj-jc38-x2m7Mattermost fails to validate user permissions when deleting comments in Boards2025-12-01ghsa · osvUS
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.
GO-2025-4172Mattermost fails to validate user permissions when deleting comments in Boards in github.com/mattermost/mattermost2025-12-02vendor · osvUS
Mattermost fails to validate user permissions when deleting comments in Boards in github.com/mattermost/mattermost. 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: .

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2025-12-01modified 2026-10-19

references (4)

External citations — patches, advisories, analysis.

scry

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