Vulnerability in Mattermost
CVE-2025-31363
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.9 fail to restrict domains the LLM can request to contact upstream which allows an authenticated user to exfiltrate data from an arbitrary server accessible to the victim via performing a prompt injection in the AI plugin's Jira tool.
EPSS: 0.003 (18.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.0 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N.
Affected products
- Mattermost — versions 10.4.0, 10.5.0, 9.11.0
- Mattermost Mattermost_server — versions 10.5.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- responsibledisclosure@mattermost.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-31363?
- CVE-2025-31363 is a low-severity vulnerability in Mattermost, classified under CWE-1426. CVSS score: 3.0/10. Published 2025-04-16.
- How severe is CVE-2025-31363?
- Low severity. CVSS v3 base score is 3.0 out of 10.
- Is CVE-2025-31363 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.