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TI-2025-16343 Aliases CVE-2025-22449GHSA-q8fg-cp3q-5jwm

Access control flaw for team admins allows unauthorized team additions

Priority LOW 18CWE-863Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

Mattermost versions 9.11.x <= 9.11.5 fail to enforce invite permissions, which allows team admins, with no permission to invite users to their team, to invite users by updating the "allow_open_invite" field via making their team public.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00272 19th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.3.0, 9.11.6github.com/mattermost/mattermost/server/v8 (Go): 9.11.6, 8.0.0-20250102081831-64c566a8280b

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
MattermostMattermost9.11.0 – 9.11.510.3.0, 9.11.6Patch availableCNA
—github.com/mattermost/mattermost/server/v8 (Go)9.11.0 to before 9.11.69.11.6Patch availableGHSA-q8fg-cp3q-5jwm
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250102081831-64c566a8280b8.0.0-20250102081831-64c566a8280bPatch availableGHSA-q8fg-cp3q-5jwm
  • Mattermost VendorMattermost Affected 9.11.0 – 9.11.5 Fixed in 10.3.0, 9.11.6 Patch available CNA
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 to before 9.11.6 Fixed in 9.11.6 Patch available GHSA-q8fg-cp3q-5jwm
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250102081831-64c566a8280b Fixed in 8.0.0-20250102081831-64c566a8280b Patch available GHSA-q8fg-cp3q-5jwm

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*9.11.0 to before 9.11.6VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.6 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.3.0, 9.11.6
  • Fix · GHSA-q8fg-cp3q-5jwm github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.6 Advisory →
  • Fix · GHSA-q8fg-cp3q-5jwm github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250102081831-64c566a8280b Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Not affected: 6 products
  • Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Advanced Cluster Security 4
  • Red Hat Ceph Storage 5
  • Red Hat Ceph Storage 6
  • Red Hat Ceph Storage 8
  • Red Hat OpenShift GitOps

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-22449
  2. 2026-10-03 Alias added: GHSA-q8fg-cp3q-5jwm

References

Advisory 2

Other 1

  • 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