Vulnerability in Mattermost
CVE-2025-6227
Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.
EPSS: 0.002 (7.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Mattermost — versions 10.5.0, 9.11.0, 10.9.0
- Mattermost Mattermost_server
Weakness classification (CWE)
Public proof-of-concept exploits
References
- responsibledisclosure@mattermost.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-6227?
- CVE-2025-6227 is a low-severity vulnerability in Mattermost, classified under Insufficiently Protected Credentials. CVSS score: 2.2/10. Published 2025-07-18.
- How severe is CVE-2025-6227?
- Low severity. CVSS v3 base score is 2.2 out of 10.
- Is CVE-2025-6227 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.