CVE-2025-31363

EUVD-2025-11357
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3 LOW
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N
MattermostCNA
3 LOW
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 36%
Affected Products (NVD)
VendorProductVersion
mattermostmattermost_server
9.11.0 ≤
𝑥
< 9.11.10
mattermostmattermost_server
10.4.0 ≤
𝑥
< 10.4.3
mattermostmattermost_server
10.5.0
𝑥
= Vulnerable software versions
References
https://mattermost.com/security-updates