CVE-2025-27933

mediumpriority · track · 17OT risk · elevatedEPSS 0.002 · 11 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.21% (11th) EPSS

CVSS 4.3 · medium

Is it mine?

28 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-28

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public

cvss

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

5.4

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:N/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 2.5

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-863USprimaryCWE-863US

affected products (28)

Products and version ranges known to be affected.

Mattermost Mattermost <10.3.4all versionscert_bundDE
Mattermost Mattermost <10.4.3all versionscert_bundDE
Mattermost Mattermost <10.5.1all versionscert_bundDE
Mattermost Mattermost <10.6.0all versionscert_bundDE
Mattermost Mattermost <9.11.9all versionscert_bundDE
Mattermost Mattermost< 10.3.4cert_bundDE
Mattermost Mattermost< 10.4.3cert_bundDE
Mattermost Mattermost< 10.5.1cert_bundDE
Mattermost Mattermost< 10.6.0cert_bundDE
Mattermost Mattermost< 9.11.9cert_bundDE
Mattermost Mattermost≤ 10.4.0 ≤10.4.2enisa_euvdEU
Mattermost Mattermost≤ 9.11.0 ≤9.11.8enisa_euvdEU
Mattermost Mattermost≤ 10.3.0 ≤10.3.3enisa_euvdEU
mattermost mattermost server10.3.0 → 10.3.4nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server10.4.0 → 10.4.3nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server9.11.0 → 9.11.9nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Bitnami mattermost10.3.0 → 10.5.1osvUSpkg:bitnami/mattermost
Bitnami mattermost9.11.0 → 10.0.0osvUSpkg:bitnami/mattermost
Go github.com/mattermost/mattermost-server< 9.11.9osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server10.3.0+incompatible → 10.3.4+incompatibleosvUSpkg:golang/github.com/mattermost/mattermost-server

showing 20 of 28

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-0410Mattermost: Mehrere SchwachstellenDeutsch2025-02-18csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Informationen offenzulegen, bestimmte Befehle auszuführen und die Verfügbarkeit zu beeinflussen.
GHSA-h5v9-xw2g-7hrqMattermost allows members with permission to convert public channels to private and convert private to public2025-03-21ghsa · osvUS
Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public.
BIT-mattermost-2025-279332025-03-28vendor · osvUS
Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public
GO-2025-3556Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server2025-03-25vendor · osvUS
Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

also known as (6)

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 2025-03-21modified 2026-06-17

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+5016 more

references (5)

External citations — patches, advisories, analysis.

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