CVE-2025-64641
Unknown Unknown - Not Provided

Improper Authorization in Mattermost Jira Plugin Enables Data Exfiltration

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: Mattermost, Inc.

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 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

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2025-64641

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

This vulnerability exists in certain versions of Mattermost where the system fails to verify that post actions invoking the /share-issue-publicly endpoint were actually created by the Jira plugin. This flaw allows a malicious Mattermost user to exfiltrate Jira tickets when other users interact with the affected posts.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of Jira tickets, as a malicious user can trick other users into interacting with posts that exfiltrate sensitive Jira ticket information. This could result in leakage of potentially confidential or sensitive project data.

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