Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Fri, 22 May 2026 13:15:00 +0000
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Fri, 22 May 2026 12:15:00 +0000
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| Metrics |
ssvc
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Fri, 22 May 2026 11:00:00 +0000
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| Description | Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637 | |
| Title | Persistent notification timing attack causing server denial of service | |
| Weaknesses | CWE-362 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-05-22T12:06:16.773Z
Reserved: 2026-03-23T08:41:57.555Z
Link: CVE-2026-4635
Updated: 2026-05-22T12:06:13.664Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-05-22T13:00:12Z