CVE-2026-4858
CRITICAL WAF: High
CVSS 9.9
Published: 2026-05-21
CWE-22
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640
WAF Coverage Analysis
Path Traversal
High WAF Coverage
OWASP: A01:2021 Broken Access Control
930xxx - Local File Inclusion
Affected Software
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 - 10.11.15 |
| mattermost | mattermost_server | 11.4.0 - 11.4.5 |
| mattermost | mattermost_server | 11.5.0 - 11.5.4 |
| mattermost | mattermost_server | 11.6.0 |
References
- mattermost.com (Vendor Advisory)