CVE-2025-6226

IDOR in CreatePost API allows for timeboxed message disclosure

State: Published
Severity: 6.5 Medium
Published: Jul 18, 2025
Updated: Aug 7, 2025
Reserved: Jun 18, 2025

Description

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	Mattermost

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
MattermostMattermost	10.5.0 through 10.5.6Affected 10.8.0 through 10.8.1Affected 10.7.0 through 10.7.3Affected 9.11.0 through 9.11.16Affected 10.9.0Not affected 10.5.8Not affected 10.8.2Not affected 10.7.4Not affected 9.11.17Not affected

References

https://mattermost.com/security-updates

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