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TI-2025-24599 Aliases CVE-2025-35965GHSA-689c-xq7x-xjwf

DoS in Mattermost Playbooks via Excessive Task Actions

Priority LOW 33CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00403 34th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.6.0, 10.4.3, 10.5.1 +1github.com/mattermost/mattermost/server/v8 (Go): 8.0.0-20250218121836-2b5275d87136+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MattermostMattermost10.4.0 – 10.4.2; 10.5.0; 9.11.0 – 9.11.1010.6.0, 10.4.3, 10.5.1, 9.11.11Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250218121836-2b5275d871368.0.0-20250218121836-2b5275d87136Patch availableGHSA-689c-xq7x-xjwf
—github.com/mattermost/mattermost-plugin-playbooks (Go)2.0.0 and later—No fix listedGHSA-689c-xq7x-xjwf
—github.com/mattermost/mattermost/server/v8 (Go)10.4.0 and later—No fix listedGHSA-689c-xq7x-xjwf
—github.com/mattermost/mattermost/server/v8 (Go)10.5.0 and later—No fix listedGHSA-689c-xq7x-xjwf
—github.com/mattermost/mattermost/server/v8 (Go)9.11.0 and later—No fix listedGHSA-689c-xq7x-xjwf
—github.com/mattermost/mattermost-plugin-playbooks (Go)before 1.41.01.41.0Patch availableGHSA-689c-xq7x-xjwf
  • Mattermost VendorMattermost Affected 10.4.0 – 10.4.2; 10.5.0; 9.11.0 – 9.11.10 Fixed in 10.6.0, 10.4.3, 10.5.1, 9.11.11 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250218121836-2b5275d87136 Fixed in 8.0.0-20250218121836-2b5275d87136 Patch available GHSA-689c-xq7x-xjwf
  • github.com/mattermost/mattermost-plugin-playbooks (Go) Vendor— Affected 2.0.0 and later Fixed in — No fix listed GHSA-689c-xq7x-xjwf
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.4.0 and later Fixed in — No fix listed GHSA-689c-xq7x-xjwf
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 and later Fixed in — No fix listed GHSA-689c-xq7x-xjwf
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 and later Fixed in — No fix listed GHSA-689c-xq7x-xjwf
  • github.com/mattermost/mattermost-plugin-playbooks (Go) Vendor— Affected before 1.41.0 Fixed in 1.41.0 Patch available GHSA-689c-xq7x-xjwf

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*9.11.0 to before 9.11.11; 10.4.0 to before 10.4.3VulnerableMattermost
cpe:2.3:a:mattermost:mattermost_server:10.5.0:-:*:*:*:*:*:*10.5.0VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.11; 10.4.0 to before 10.4.3 Vulnerable ·Mattermost
  • cpe:2.3:a:mattermost:mattermost_server:10.5.0:-:*:*:*:*:*:* Versions 10.5.0 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.6.0, 10.4.3, 10.5.1, 9.11.11
  • Fix · GHSA-689c-xq7x-xjwf github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250218121836-2b5275d87136 Advisory →
  • Fix · GHSA-689c-xq7x-xjwf github.com/mattermost/mattermost-plugin-playbooks (Go) Fixed in 1.41.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-35965
  2. 2026-10-03 Alias added: GHSA-689c-xq7x-xjwf

References

Advisory 2

Other 3

  • TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
  • TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
  • TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
  • TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
  • TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
  • TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
See all 505 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences