Unvalidated Channel Ownership in Mattermost Subscription Edit 10.11.17-11.7.x
CVE-2026-6062 Published on June 22, 2026
IDOR in Jira plugin subscription edit endpoint
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650
Vulnerability Analysis
CVE-2026-6062 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2026-6062 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2026-6062
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Affected Versions
Mattermost:- Version 11.7.0, <= 11.7.0 is affected.
- Version 11.6.0, <= 11.6.2 is affected.
- Version 11.5.0, <= 11.5.5 is affected.
- Version 10.11.0, <= 10.11.17 is affected.
- Version 11.8.0 is unaffected.
- Version 11.7.1 is unaffected.
- Version 11.6.3 is unaffected.
- Version 11.5.6 is unaffected.
- Version 10.11.18 is unaffected.