CVE-2025-64641

Mattermost Jira plugin crafted action leaks Jira issue details

Published: Dec 24, 2025Updated: Dec 31, 2025 Sources: CVE List NVD GHSACWE-863

4.1MEDIUM

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

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:NIntegrity

None

A:NAvailability

None

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Weaknesses

CWE-863

Affected Products

Mattermost

commercial·US

MattermostOn-premWeb App

Communications / messaging-chat

mattermost serverOn-premWeb App

Communications / messaging-chat

package-ecosystem

github.com/mattermost/mattermost/server/v8

OSS Libraries

github.com/mattermost/mattermost-server

OSS Libraries

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://mattermost.com/security-updates

mattermost.com

https://nvd.nist.gov/vuln/detail/CVE-2025-64641

nvd.nist.gov

https://github.com/mattermost/mattermost/pull/34551

github.com

and 3 more references View all →

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