CVE-2026-19600

mediumpriority · track · 20EPSS 0.002 · 15 %ileDEUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.24% (15th) EPSS

CVSS 4.9 · medium

Is it mine?

14 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-27

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763

cvss

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

4.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 1.2 · impact 3.6

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 0.9 · impact 3.6

v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/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-532US

affected products (14)

Products and version ranges known to be affected.

Mattermost Mattermost< 11.10.1cert_bundDE
Mattermost Mattermost< 11.11.0cert_bundDE
Mattermost Mattermost< 11.7.10cert_bundDE
Mattermost Mattermost< 11.8.6cert_bundDE
Mattermost Mattermost< 11.9.2cert_bundDE
Mattermost Mattermost Mattermost <11.10.1< 11.10.1cert_bundDE
Mattermost Mattermost Mattermost <11.11.0< 11.11.0cert_bundDE
Mattermost Mattermost Mattermost <11.7.10< 11.7.10cert_bundDE
Mattermost Mattermost Mattermost <11.8.6< 11.8.6cert_bundDE
Mattermost Mattermost Mattermost <11.9.2< 11.9.2cert_bundDE
mattermost mattermost server11.10.0 → 11.10.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.7.0 → 11.7.10nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.8.0 → 11.8.6nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
mattermost mattermost server11.9.0 → 11.9.2nvdUScpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-4009Mattermost: Mehrere SchwachstellenDeutsch2026-10-15csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren.

sources

Which sources assert this record, and when.

cert_bund nvd NVD CVE.org MITRE

published 2026-10-16modified 2026-10-27

references (1) nvd

External citations — patches, advisories, analysis.

https://mattermost.com/security-updatesVendor Advisory

scry

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