CVE-2026-4635
Analyzed
Analyzed - Analysis Complete
BaseFortify
Publication date: 2026-05-22
Last updated on: 2026-05-22
Assigner: Mattermost, Inc.
Description
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
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | mattermost_server | From 10.11.0 (inc) to 10.11.15 (exc) |
| mattermost | mattermost_server | From 11.4.0 (inc) to 11.4.5 (exc) |
| mattermost | mattermost_server | From 11.5.0 (inc) to 11.5.4 (exc) |
| mattermost | mattermost_server | From 11.6.0 (inc) to 11.6.1 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-362 | The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. |
Attack-Flow Graph
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