CVE-2026-13426: 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 attack
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
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-13426
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-134260.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-13426 | coverage & exploitation status | NVD · CVE.org |
More from NVD Recent CVEs
- unknownCVE-2026-57828: The Joomla extension Phoca Downloads is vulnerable to an authenticated arbitrary file upload t…2026-07-11
- unknownCVE-2026-57827: The Joomla extension RSFiles is vulnerable to an unauthenticated arbitrary file upload that al…2026-07-11
- highCVE-2026-1359: The Genolve – AI image AI video generation plugin for WordPress is vulnerable to unauthorized m…2026-07-11
- highCVE-2026-9282: The W3 Total Cache plugin for WordPress is vulnerable to Directory Traversal in all versions up…2026-07-11
- mediumCVE-2026-9017: The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to autho…2026-07-11