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TI-2025-03667 Aliases CVE-2025-4128GHSA-jwhw-xf5v-qgxc

Mattermost Guest User Information Disclosure Vulnerability

Priority LOW 20CWE-863Published · 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 · NVD. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.8.0, 10.5.5, 9.11.14github.com/mattermost/mattermost/server/v8 (Go): 8.0.0-20250422131222-701ddc896a10+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 – 10.5.4; 9.11.0 – 9.11.1310.8.0, 10.5.5, 9.11.14Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250422131222-701ddc896a108.0.0-20250422131222-701ddc896a10Patch availableGHSA-jwhw-xf5v-qgxc
—github.com/mattermost/mattermost-server (Go)10.5.0 to before 10.5.510.5.5Patch availableGHSA-jwhw-xf5v-qgxc
—github.com/mattermost/mattermost-server (Go)9.11.0 to before 9.11.149.11.14Patch availableGHSA-jwhw-xf5v-qgxc
  • Mattermost VendorMattermost Affected 10.5.0 – 10.5.4; 9.11.0 – 9.11.13 Fixed in 10.8.0, 10.5.5, 9.11.14 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250422131222-701ddc896a10 Fixed in 8.0.0-20250422131222-701ddc896a10 Patch available GHSA-jwhw-xf5v-qgxc
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0 to before 10.5.5 Fixed in 10.5.5 Patch available GHSA-jwhw-xf5v-qgxc
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 9.11.0 to before 9.11.14 Fixed in 9.11.14 Patch available GHSA-jwhw-xf5v-qgxc

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*9.11.0 to before 9.11.14; 10.5.0 to before 10.5.5VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.14; 10.5.0 to before 10.5.5 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.8.0, 10.5.5, 9.11.14
  • Fix · GHSA-jwhw-xf5v-qgxc github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250422131222-701ddc896a10 Advisory →
  • Fix · GHSA-jwhw-xf5v-qgxc github.com/mattermost/mattermost-server (Go) Fixed in 10.5.5 Advisory →
  • Fix · GHSA-jwhw-xf5v-qgxc github.com/mattermost/mattermost-server (Go) Fixed in 9.11.14 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-4128
  2. 2026-10-03 Alias added: GHSA-jwhw-xf5v-qgxc

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