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Mattermost doesn't restrict domains LLM can request to contact upstream

Low severity GitHub Reviewed Published Apr 16, 2025 to the GitHub Advisory Database • Updated Apr 23, 2025

Package

gomod github.com/mattermost/mattermost/server/v8 (Go)

Affected versions

>= 10.5.0, < 10.5.1
>= 10.4.0, < 10.4.3
>= 9.11.0, < 9.11.10
< 8.0.0-20250218121836-2b5275d87136

Patched versions

10.5.1
10.4.3
9.11.10
8.0.0-20250218121836-2b5275d87136

Description

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.

References

Published by the National Vulnerability Database Apr 16, 2025
Published to the GitHub Advisory Database Apr 16, 2025
Reviewed Apr 16, 2025
Last updated Apr 23, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(6th percentile)

Weaknesses

CVE ID

CVE-2025-31363

GHSA ID

GHSA-9h6j-4ffx-cm84

Source code

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