CVE-2025-35965 - CVE House

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Status published Medium CVE-2025-35965

DoS in Mattermost Playbooks via Excessive Task Actions

6.5 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

vultza (vultza)

References

https://mattermost.com/security-updates

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Affected Vendor

Mattermost

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Affected Software

Mattermost

Vulnerable Versions:

10.4.0, 10.5.0, 9.11.0, 10.6.0, 10.4.3, 10.5.1, 9.11.11

Timeline

Official Publish: April 24th, 2025

Last Modified: April 24th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service

T1498 Network Denial of Service

T1190 Exploit Public-Facing Application

T1562 Impair Defenses

Defense Evasion

T1046 Network Service Discovery