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TI-2025-27604 Aliases CVE-2025-41443GHSA-7cr3-38jm-6p45

Guest user can discover active public channels

Priority LOW 20CWE-862Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00313 24th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.12.0, 10.5.13, 10.11.3github.com/mattermost/mattermost/server/v8 (Go): 8.0.0-20250822090405-e8c7e7d0252b+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
MattermostMattermost10.5.0 – 10.5.12; 10.11.0 – 10.11.210.12.0, 10.5.13, 10.11.3Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250822090405-e8c7e7d0252b8.0.0-20250822090405-e8c7e7d0252bPatch availableGHSA-7cr3-38jm-6p45
—github.com/mattermost/mattermost-server (Go)10.5.0 to before 10.5.1110.5.11Patch availableGHSA-7cr3-38jm-6p45
—github.com/mattermost/mattermost-server (Go)10.11.0 to before 10.11.310.11.3Patch availableGHSA-7cr3-38jm-6p45
  • Mattermost VendorMattermost Affected 10.5.0 – 10.5.12; 10.11.0 – 10.11.2 Fixed in 10.12.0, 10.5.13, 10.11.3 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250822090405-e8c7e7d0252b Fixed in 8.0.0-20250822090405-e8c7e7d0252b Patch available GHSA-7cr3-38jm-6p45
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0 to before 10.5.11 Fixed in 10.5.11 Patch available GHSA-7cr3-38jm-6p45
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.11.0 to before 10.11.3 Fixed in 10.11.3 Patch available GHSA-7cr3-38jm-6p45

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*10.5.0 to before 10.5.11; 10.11.0 to before 10.11.3VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 10.5.0 to before 10.5.11; 10.11.0 to before 10.11.3 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.12.0, 10.5.13, 10.11.3
  • Fix · GHSA-7cr3-38jm-6p45 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250822090405-e8c7e7d0252b Advisory →
  • Fix · GHSA-7cr3-38jm-6p45 github.com/mattermost/mattermost-server (Go) Fixed in 10.5.11 Advisory →
  • Fix · GHSA-7cr3-38jm-6p45 github.com/mattermost/mattermost-server (Go) Fixed in 10.11.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-41443
  2. 2026-10-03 Alias added: GHSA-7cr3-38jm-6p45

References

Advisory 2

Other 4

  • 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