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.

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - responsibledisclosure@mattermost.com

Published

2025-04-16

Last modified

2025-04-16

Weaknesses

CWE-1426

Affected products

• Mattermost (Mattermost)
• Mattermost Server (Mattermost)

References

• https://mattermost.com/security-updates