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.

Scoring

Severity

LOW

CVSS base score

3

CVSS vector

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

EPSS probability

0.27%

CWE

CWE-1426

Published

2025-04-16

Last modified

2026-03-12

Affected products

• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost

Weakness type

• CWE-1426

Related vulnerabilities

• CVE-2025-55074 — Channel member objects leak read status
• CVE-2025-62453 — GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability

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