TI-2025-02198 Aliases CVE-2025-2527 GHSA-h356-3mfw-x368

Improper access control to group information

LOW 20CWE-863Published 2025-05-15 · Updated 2025-05-15

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-863.

Summary

Mattermost versions 10.5.x <= 10.5.2, 9.11.x <= 9.11.11 failed to properly verify a user's permissions when accessing groups, which allows an attacker to view group information via an API request.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00314 24th percentileScored 2026-11-07

Fix Fixed Mattermost (Mattermost): 10.7.0, 10.5.3, 9.11.12github.com/mattermost/mattermost/server/v8 (Go): 10.5.3, 9.11.12, 8.0.0-20250411064244-844447fbd57c

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

Vendor	Product	Affected versions	Fixed in	Status	Source
Mattermost	Mattermost	10.5.0 – 10.5.2; 9.11.0 – 9.11.11	10.7.0, 10.5.3, 9.11.12	Patch available	CNA
—	github.com/mattermost/mattermost/server/v8 (Go)	10.5.0 to before 10.5.3	10.5.3	Patch available	GHSA-h356-3mfw-x368
—	github.com/mattermost/mattermost/server/v8 (Go)	9.11.0 to before 9.11.12	9.11.12	Patch available	GHSA-h356-3mfw-x368
—	github.com/mattermost/mattermost/server/v8 (Go)	before 8.0.0-20250411064244-844447fbd57c	8.0.0-20250411064244-844447fbd57c	Patch available	GHSA-h356-3mfw-x368

Mattermost VendorMattermost Affected 10.5.0 – 10.5.2; 9.11.0 – 9.11.11 Fixed in 10.7.0, 10.5.3, 9.11.12 Patch available CNA
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 to before 10.5.3 Fixed in 10.5.3 Patch available GHSA-h356-3mfw-x368
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 to before 9.11.12 Fixed in 9.11.12 Patch available GHSA-h356-3mfw-x368
github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250411064244-844447fbd57c Fixed in 8.0.0-20250411064244-844447fbd57c Patch available GHSA-h356-3mfw-x368

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mattermost:mattermost_server::::::::	9.11.0 to before 9.11.12; 10.5.0 to before 10.5.3	Vulnerable	Mattermost

cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.12; 10.5.0 to before 10.5.3 Vulnerable ·Mattermost

Remediation

Fix · CNA Mattermost (Mattermost) Fixed in 10.7.0, 10.5.3, 9.11.12
Fix · GHSA-h356-3mfw-x368 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.3 Advisory →
Fix · GHSA-h356-3mfw-x368 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.12 Advisory →
Fix · GHSA-h356-3mfw-x368 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250411064244-844447fbd57c Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-2527
2026-10-03 Alias added: GHSA-h356-3mfw-x368

References

Advisory 2

Other 1

https://github.com/mattermost/mattermost

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