Read the docs
TI-2025-27572 Aliases CVE-2025-41395GHSA-3g36-gf7c-75qw

Webapp DoS via malicious retrospective post in Playbooks

Priority LOW 33CWE-1287Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate the props used by the RetrospectivePost custom post type in the Playbooks plugin, which allows an attacker to create a specially crafted post with maliciously crafted props and cause a denial of service (DoS) of the web app for all users.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.005 43rd 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-plugin-playbooks (Go)2.0.0 and later—No fix listedGHSA-3g36-gf7c-75qw
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250218121836-2b5275d871368.0.0-20250218121836-2b5275d87136Patch availableGHSA-3g36-gf7c-75qw
—github.com/mattermost/mattermost/server/v8 (Go)10.4.0 and later—No fix listedGHSA-3g36-gf7c-75qw
—github.com/mattermost/mattermost/server/v8 (Go)10.5.0 and later—No fix listedGHSA-3g36-gf7c-75qw
—github.com/mattermost/mattermost/server/v8 (Go)9.11.0 and later—No fix listedGHSA-3g36-gf7c-75qw
—github.com/mattermost/mattermost-plugin-playbooks (Go)before 1.41.01.41.0Patch availableGHSA-3g36-gf7c-75qw
  • 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-plugin-playbooks (Go) Vendor— Affected 2.0.0 and later Fixed in — No fix listed GHSA-3g36-gf7c-75qw
  • 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-3g36-gf7c-75qw
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.4.0 and later Fixed in — No fix listed GHSA-3g36-gf7c-75qw
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 and later Fixed in — No fix listed GHSA-3g36-gf7c-75qw
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 and later Fixed in — No fix listed GHSA-3g36-gf7c-75qw
  • github.com/mattermost/mattermost-plugin-playbooks (Go) Vendor— Affected before 1.41.0 Fixed in 1.41.0 Patch available GHSA-3g36-gf7c-75qw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*9.11.0 to before 9.11.11; 10.4.0 to before 10.4.3; 10.5.0 to before 10.5.1VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.11; 10.4.0 to before 10.4.3; 10.5.0 to before 10.5.1 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.6.0, 10.4.3, 10.5.1, 9.11.11
  • Fix · GHSA-3g36-gf7c-75qw github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250218121836-2b5275d87136 Advisory →
  • Fix · GHSA-3g36-gf7c-75qw github.com/mattermost/mattermost-plugin-playbooks (Go) Fixed in 1.41.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-41395
  2. 2026-10-03 Alias added: GHSA-3g36-gf7c-75qw

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