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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (18.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Mattermost — versions 10.4.0, 10.5.0, 9.11.0
- Mattermost Server — versions 10.5.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- mattermost.com/security-updates (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.