CVE-2026-6341

4.3 MEDIUM

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or a...

Published: 2026-05-18 · Last updated: 2026-05-29

Severity and scoring

CVSS: 4.3 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE: CWE-863

Affected products

Vendor	Product
mattermost	mattermost_server

Description

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-6341
[Vendor advisory]https://mattermost.com/security-updates

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