CVE-2026-9699

mediumpriority · track · 0EPSS 0.005 · 39 %ileDEEU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.46% (39th) EPSS

CVSS 6.8 · medium

Is it mine?

19 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-23

Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries generated during authentication failures. Mattermost Advisory ID: MMSA-2026-00609

cvss

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

6.8

010

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

v3.16.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:Nsecondary · responsibledisclosure@mattermost.comexploitability 2.3 · impact 4

v3.16.2mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/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 (19)

Products and version ranges known to be affected.

Mattermost Mattermost Plugins <10.11.19all versionscert_bundDE
Mattermost Mattermost Plugins <11.5.7all versionscert_bundDE
Mattermost Mattermost Plugins <11.6.4all versionscert_bundDE
Mattermost Mattermost Plugins <11.7.0all versionscert_bundDE
Mattermost Mattermost Server <10.11.19all versionscert_bundDE
Mattermost Mattermost Server <11.5.7all versionscert_bundDE
Mattermost Mattermost Server <11.6.4all versionscert_bundDE
Mattermost Mattermost Server <11.7.0all versionscert_bundDE
Mattermost Mattermost≤ Plugins <11.5.7cert_bundDE
Mattermost Mattermost≤ Plugins <10.11.19cert_bundDE
Mattermost Mattermost≤ Plugins <11.6.4cert_bundDE
Mattermost Mattermost≤ Plugins <11.7.0cert_bundDE
Mattermost Mattermost≤ Server <10.11.19cert_bundDE
Mattermost Mattermost≤ Server <11.5.7cert_bundDE
Mattermost Mattermost≤ Server <11.6.4cert_bundDE
Mattermost Mattermost≤ Server <11.7.0cert_bundDE
Mattermost Mattermost≤ 0 ≤11.3.6enisa_euvdEU
Mattermost Mattermost≤ 0 ≤11.6.5enisa_euvdEU
Mattermost Mattermost≤ 0 ≤10.18.11enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1705Mattermost Server und Plugins: Mehrere Schwachstellen ermöglichen nicht spezifizierten AngriffDeutsch2026-05-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server und Plugins ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-06-26modified 2026-06-26

references (3)

External citations — patches, advisories, analysis.

scry

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