Mattermost Playbooks fails to validate the uniqueness and quantity of task actions
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-35965US | high7.5 | — | ||
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL opera… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/mattermost/mattermost-plugin-playbooksPACKAGE
- https://github.com/mattermost/mattermost-plugin-playbooks/commit/bf2633dad09f5768ce2bea4b7c5ffb74050052a8WEB
- https://github.com/mattermost/mattermost/commit/2b5275d87136f07e016c8eca09a2f004b31afc8aWEB
- https://mattermost.com/security-updatesWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-35965ADVISORY
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