Read the docs
TI-2025-08314 Aliases CVE-2025-9072GHSA-69j8-prx2-vx98

One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter

Priority LOW 34CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00176 7th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.11.0, 10.10.2, 10.5.10 +1github.com/mattermost/mattermost-server (Go): 10.10.2, 10.5.10, 10.9.5+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MattermostMattermost10.10.0 – 10.10.1; 10.5.0 – 10.5.9; 10.9.0 – 10.9.410.11.0, 10.10.2, 10.5.10, 10.9.5Patch availableCNA
—github.com/mattermost/mattermost-server (Go)10.10.0 to before 10.10.210.10.2Patch availableGHSA-69j8-prx2-vx98
—github.com/mattermost/mattermost-server (Go)10.5.0 to before 10.5.1010.5.10Patch availableGHSA-69j8-prx2-vx98
—github.com/mattermost/mattermost-server (Go)10.9.0 to before 10.9.510.9.5Patch availableGHSA-69j8-prx2-vx98
—github.com/mattermost/mattermost/server/v8 (Go)before 8.0.0-20250731063404-9eebaadf8f728.0.0-20250731063404-9eebaadf8f72Patch availableGHSA-69j8-prx2-vx98
  • Mattermost VendorMattermost Affected 10.10.0 – 10.10.1; 10.5.0 – 10.5.9; 10.9.0 – 10.9.4 Fixed in 10.11.0, 10.10.2, 10.5.10, 10.9.5 Patch available CNA
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.10.0 to before 10.10.2 Fixed in 10.10.2 Patch available GHSA-69j8-prx2-vx98
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0 to before 10.5.10 Fixed in 10.5.10 Patch available GHSA-69j8-prx2-vx98
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.9.0 to before 10.9.5 Fixed in 10.9.5 Patch available GHSA-69j8-prx2-vx98
  • github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250731063404-9eebaadf8f72 Fixed in 8.0.0-20250731063404-9eebaadf8f72 Patch available GHSA-69j8-prx2-vx98

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*10.5.0 to before 10.5.10; 10.9.0 to before 10.9.5; 10.10.0 to before 10.10.2VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 10.5.0 to before 10.5.10; 10.9.0 to before 10.9.5; 10.10.0 to before 10.10.2 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 10.11.0, 10.10.2, 10.5.10, 10.9.5
  • Fix · GHSA-69j8-prx2-vx98 github.com/mattermost/mattermost-server (Go) Fixed in 10.10.2 Advisory →
  • Fix · GHSA-69j8-prx2-vx98 github.com/mattermost/mattermost-server (Go) Fixed in 10.5.10 Advisory →
  • Fix · GHSA-69j8-prx2-vx98 github.com/mattermost/mattermost-server (Go) Fixed in 10.9.5 Advisory →
  • Fix · GHSA-69j8-prx2-vx98 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250731063404-9eebaadf8f72 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-9072
  2. 2026-10-03 Alias added: GHSA-69j8-prx2-vx98

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