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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

PUBLISHED Reserved 2025-11-26 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Mattermost




MEDIUM: 4.1CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

11.1.0 (semver)
affected

11.0.0 (semver)
affected

10.12.0 (semver)
affected

10.11.0 (semver)
affected

11.2.0
unaffected

11.1.1
unaffected

11.0.6
unaffected

10.12.4
unaffected

10.11.8
unaffected

Credits

Juho Forsén finder

References

mattermost.com/security-updates (MMSA-2025-00551) vendor-advisory

cve.org (CVE-2025-64641)

nvd.nist.gov (CVE-2025-64641)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.