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TI-2025-13111 Aliases CVE-2025-14350GHSA-57cc-2pf4-mhmx

Information disclosure via channel mentions in posts

Priority LOW 19CWE-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 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00189 8th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 11.3.0, 11.1.3, 10.11.10 +1github.com/mattermost/mattermost/server/v8 (Go): 8.0.0-20251209134645-761e56bb11cc+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
MattermostMattermost11.1.0 – 11.1.2; 10.11.0 – 10.11.9; 11.2.0 – 11.2.111.3.0, 11.1.3, 10.11.10, 11.2.2Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20251209134645-761e56bb11cc8.0.0-20251209134645-761e56bb11ccPatch availableGHSA-57cc-2pf4-mhmx
—github.com/mattermost/mattermost-server (Go)11.1.0 and later—No fix listedGHSA-57cc-2pf4-mhmx
—github.com/mattermost/mattermost-server (Go)10.11.0 and later—No fix listedGHSA-57cc-2pf4-mhmx
—github.com/mattermost/mattermost-server (Go)11.2.0 and later—No fix listedGHSA-57cc-2pf4-mhmx
—github.com/mattermost/mattermost-server (Go)before 5.3.2-0.20251209134645-761e56bb11cc5.3.2-0.20251209134645-761e56bb11ccPatch availableGHSA-57cc-2pf4-mhmx
  • Mattermost VendorMattermost Affected 11.1.0 – 11.1.2; 10.11.0 – 10.11.9; 11.2.0 – 11.2.1 Fixed in 11.3.0, 11.1.3, 10.11.10, 11.2.2 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20251209134645-761e56bb11cc Fixed in 8.0.0-20251209134645-761e56bb11cc Patch available GHSA-57cc-2pf4-mhmx
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 11.1.0 and later Fixed in — No fix listed GHSA-57cc-2pf4-mhmx
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.11.0 and later Fixed in — No fix listed GHSA-57cc-2pf4-mhmx
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 11.2.0 and later Fixed in — No fix listed GHSA-57cc-2pf4-mhmx
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected before 5.3.2-0.20251209134645-761e56bb11cc Fixed in 5.3.2-0.20251209134645-761e56bb11cc Patch available GHSA-57cc-2pf4-mhmx

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*10.11.0 to before 10.11.10; 11.1.0 to before 11.1.3; 11.2.0 to before 11.2.2VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 10.11.0 to before 10.11.10; 11.1.0 to before 11.1.3; 11.2.0 to before 11.2.2 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 11.3.0, 11.1.3, 10.11.10, 11.2.2
  • Fix · GHSA-57cc-2pf4-mhmx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20251209134645-761e56bb11cc Advisory →
  • Fix · GHSA-57cc-2pf4-mhmx github.com/mattermost/mattermost-server (Go) Fixed in 5.3.2-0.20251209134645-761e56bb11cc Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-14350
  2. 2026-10-03 Alias added: GHSA-57cc-2pf4-mhmx

References

Advisory 2

Other 2

  • 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