CVE-2023-3581

highpriority · track · 32EPSS 0.003 · 18 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.26% (18th) EPSS

CVSS 8.1 · high

Is it mine?

9 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

cvss

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

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.2–8.1

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 5.9

v3.16.2mediumCVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.16.2mediumCVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · responsibledisclosure@mattermost.comexploitability 0.3 · impact 5.9

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-346USprimary

affected products (9)

Products and version ranges known to be affected.

Mattermost Mattermost≤ 0 ≤7.10.2enisa_euvdEU
Mattermost Mattermost≤ 0 ≤7.8.6enisa_euvdEU
Mattermost Mattermost≤ 0 ≤7.9.4enisa_euvdEU
mattermost mattermost server7.10.0 → 7.10.3nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server7.8.0 → 7.8.7nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server7.9.0 → 7.9.5nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Bitnami mattermost7.10.0 → 7.10.3osvUSpkg:bitnami/mattermost
Bitnami mattermost7.8.0 → 7.8.7osvUSpkg:bitnami/mattermost
Bitnami mattermost7.9.0 → 7.9.5osvUSpkg:bitnami/mattermost

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-1486Mattermost: Mehrere SchwachstellenDeutsch2023-06-15csaf · cert_bundDE
Ein entfernter anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Mattermost ausnutzen, um einen Denial-of-Service-Zustand auszulösen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen und Daten zu manipulieren.
BIT-mattermost-2023-35812024-03-06vendor · osvUS
Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv cert_bund NVD CVE.org MITRE

published 2023-07-17modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

scry

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