CVE-2025-27715: Auto-Enrollment of Team Admins into Private Channels without explicit consent

3.3 CVSS

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.

Classification

CVE ID: CVE-2025-27715

CVSS Base Severity: LOW

CVSS Base Score: 3.3

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

Problem Types

CWE-863: Incorrect Authorization

Affected Products

Vendor: Mattermost

Product: Mattermost

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 8.27% (scored less or equal to compared to others)

EPSS Date: 2025-04-18 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-27715
https://mattermost.com/security-updates

Timeline