CVE-2026-13426 — Client4 fails to validate path parameters
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an att…
Published: 2026-06-26 · CVSS: 5.4 · CVSS 3.1
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7