Mattermost <=11.1.x issue exfil via /share-issue-publicly Jira POST
CVE-2025-64641 Published on December 24, 2025
Mattermost Jira plugin crafted action leaks Jira issue details
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 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts
Vulnerability Analysis
CVE-2025-64641 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-64641 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-64641
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Affected Versions
Mattermost:- Version 11.1.0, <= 11.1.0 is affected.
- Version 11.0.0, <= 11.0.5 is affected.
- Version 10.12.0, <= 10.12.3 is affected.
- Version 10.11.0, <= 10.11.7 is affected.
- Version 11.2.0 is unaffected.
- Version 11.1.1 is unaffected.
- Version 11.0.6 is unaffected.
- Version 10.12.4 is unaffected.
- Version 10.11.8 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.