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TI-2025-05633 Aliases CVE-2025-6227GHSA-4fwj-8595-wp25

Invite token is used as part of the secure communication

Priority LOW 15CWE-522Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-522.

Summary

Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.9.0, 10.5.8, 9.11.17github.com/mattermost/mattermost-server (Go): 10.5.8, 9.11.17+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 – 10.5.7; 9.11.0 – 9.11.1610.9.0, 10.5.8, 9.11.17Patch availableCNA
—github.com/mattermost/mattermost-server (Go)10.5.0 to before 10.5.810.5.8Patch availableGHSA-4fwj-8595-wp25
—github.com/mattermost/mattermost-server (Go)9.11.0 to before 9.11.179.11.17Patch availableGHSA-4fwj-8595-wp25
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250612074655-8f8612c637838.0.0-20250612074655-8f8612c63783Patch availableGHSA-4fwj-8595-wp25
  • Mattermost VendorMattermost Affected 10.5.0 – 10.5.7; 9.11.0 – 9.11.16 Fixed in 10.9.0, 10.5.8, 9.11.17 Patch available CNA
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0 to before 10.5.8 Fixed in 10.5.8 Patch available GHSA-4fwj-8595-wp25
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 9.11.0 to before 9.11.17 Fixed in 9.11.17 Patch available GHSA-4fwj-8595-wp25
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250612074655-8f8612c63783 Fixed in 8.0.0-20250612074655-8f8612c63783 Patch available GHSA-4fwj-8595-wp25

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*9.11.0 to before 9.11.17; 10.5.0 to before 10.5.8VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.17; 10.5.0 to before 10.5.8 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.9.0, 10.5.8, 9.11.17
  • Fix · GHSA-4fwj-8595-wp25 github.com/mattermost/mattermost-server (Go) Fixed in 10.5.8 Advisory →
  • Fix · GHSA-4fwj-8595-wp25 github.com/mattermost/mattermost-server (Go) Fixed in 9.11.17 Advisory →
  • Fix · GHSA-4fwj-8595-wp25 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250612074655-8f8612c63783 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-6227
  2. 2026-10-03 Alias added: GHSA-4fwj-8595-wp25

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