Insecure Access Control in Mattermost Communication Platform
CVE-2026-24692

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 March 2026

What is CVE-2026-24692?

Mattermost versions 11.3.0 and earlier in the 11.3.x series, as well as 11.2.2 and earlier in the 11.2.x series, and 10.11.10 and earlier in the 10.11.x series, contain an insecure access control vulnerability in the search API endpoints. This flaw permits guest users who lack read permissions to retrieve posts and files from channels through unauthorized search API requests, potentially exposing sensitive information. For further details, refer to the Mattermost Advisory: MMSA-2025-00554.

Affected Version(s)

Mattermost 11.3.0

Mattermost 11.2.0 <= 11.2.2

Mattermost 10.11.0 <= 10.11.10

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

0x7oda7123
.