What is CVE-2025-35965?

CVE-2025-35965 is a medium-severity vulnerability in Mattermost, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2025-04-24.

How severe is CVE-2025-35965?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Mattermost

CVE-2025-35965

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.

EPSS: 0.004 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mattermost — versions 10.4.0, 10.5.0, 9.11.0
Mattermost Mattermost_server — versions 10.5.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-35965?: CVE-2025-35965 is a medium-severity vulnerability in Mattermost, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2025-04-24.
How severe is CVE-2025-35965?: Medium severity. CVSS v3 base score is 6.5 out of 10.