Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627
Metrics
Affected Vendors & Products
References
| Link | Providers |
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| https://mattermost.com/security-updates |
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History
Tue, 19 May 2026 17:45:00 +0000
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| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
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Mattermost mattermost Server
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Mon, 18 May 2026 15:30:00 +0000
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Mon, 18 May 2026 09:45:00 +0000
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Mon, 18 May 2026 08:00:00 +0000
| Type | Values Removed | Values Added |
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| Description | Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627 | |
| Title | Mattermost fails to enforce create_post permission when editing posts | |
| Weaknesses | CWE-862 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-05-18T06:53:29.311Z
Updated: 2026-05-18T14:35:00.560Z
Reserved: 2026-03-06T12:07:05.977Z
Link: CVE-2026-3637
Updated: 2026-05-18T14:34:56.006Z
Status : Analyzed
Published: 2026-05-18T08:16:14.040
Modified: 2026-05-19T17:34:01.570
Link: CVE-2026-3637
No data.