CVE-2025-27715

LowCVSS 2.7/10Last modified Jun 17, 2026

Description

Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.

Metrics

CVSS 3.1 2.7/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-863

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 9.11.0, <= 9.11.8

References

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

Timeline

Published: Mar 21, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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