CVE-2025-35965

DoS in Mattermost Playbooks via Excessive Task Actions

State: Published
Severity: 6.5 Medium
Published: Apr 24, 2025
Updated: Apr 24, 2025
Reserved: Apr 22, 2025

Description

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.

Scores

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

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
MattermostMattermost	10.4.0 through 10.4.2Affected 10.5.0Affected 9.11.0 through 9.11.10Affected 10.6.0Not affected 10.4.3Not affected 10.5.1Not affected 9.11.11Not affected

References

https://mattermost.com/security-updates

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