CVE-2025-14273: Mattermost Jira plugin user spoofing enables Jira request forgery.

Severity: high (CVSS 8.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-22 · updated 2026-10-14
Weakness: CWE-303

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555

Affected products

Mattermost: from 10.11.0 before 10.11.8; from 10.12.0 before 10.12.4; from 11.0.0 before 11.0.6; from 11.1.0 before 11.1.1 — fixed in 10.11.8, 10.12.4, 11.0.6, 11.1.1

How to fix

Upgrade to a fixed version: Mattermost 10.11.8, 10.12.4, 11.0.6, 11.1.1. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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