CVE-2025-55070

highpriority · track · 30OT risk · elevatedEPSS 0.003 · 24 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.32% (24th) EPSS

CVSS 7.5 · high

Is it mine?

18 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-306USCWE-306US

affected products (18)

Products and version ranges known to be affected.

Mattermost Mattermost Mobile <2.33.0all versionscert_bundDE
Mattermost Mattermost Server <10.11.4all versionscert_bundDE
Mattermost Mattermost Server <10.12.1all versionscert_bundDE
Mattermost Mattermost Server <10.5.12all versionscert_bundDE
Mattermost Mattermost Server <11.0.0all versionscert_bundDE
Mattermost Mattermost≤ Server <11.0.0cert_bundDE
Mattermost Mattermost≤ Mobile <2.33.0cert_bundDE
Mattermost Mattermost≤ Server <10.11.4cert_bundDE
Mattermost Mattermost≤ Server <10.12.1cert_bundDE
Mattermost Mattermost≤ Server <10.5.12cert_bundDE
Mattermost Mattermost≤ <11 ≤<11enisa_euvdEU
Mattermost Inc Mattermost≤ 11.0.0fstec_bduRU
mattermost mattermost server< 11.0.0nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Go github.com/mattermost/mattermost-server< 11.1.0osvUSpkg:golang/github.com/mattermost/mattermost-server
Go github.com/mattermost/mattermost-server< 11.1.0+incompatibleosvUSpkg: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< 8.0.0-20250912063506-7d8b7b5e4a60osvUSpkg:golang/github.com/mattermost/mattermost/server/v8

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2315Mattermost Server und Mobile: Mehrere SchwachstellenDeutsch2025-10-15csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server und Mobile ausnutzen, um Informationen offenzulegen oder einen Denial of Service zu verursachen.
GHSA-xpg8-8xpv-948pMattermost does not enforce MFA on WebSocket connections2025-11-14ghsa · osvUS
Mattermost versions < 11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events.
GO-2025-4128Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server2025-11-17vendor · osvUS
Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server

also known as (7)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund nvd NVD CVE.org MITRE

published 2025-11-14modified 2026-10-19

references (5)

External citations — patches, advisories, analysis.

scry

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