CVE-2026-13426
Awaiting Analysis Awaiting Analysis - Queue
Path Traversal in Mattermost Go Module

Publication date: 2026-06-26

Last updated on: 2026-06-26

Assigner: Mattermost, Inc.

Description
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
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-06-26
Last Modified
2026-06-26
Generated
2026-06-26
AI Q&A
2026-06-26
EPSS Evaluated
N/A
NVD
CVE-2026-13426
EUVD
EUVD-2026-39661
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost to 0.1.22 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

The vulnerability exists in the Mattermost Go module github.com/mattermost/mattermost/server/public versions prior to v0.1.22. It occurs because the software fails to properly validate path parameters when constructing API route paths.

This flaw allows an attacker to craft IDs containing path traversal components, which can redirect API calls to unintended endpoints.

Impact Analysis

This vulnerability can impact you by allowing an attacker to redirect API calls to unintended endpoints, potentially leading to unauthorized access or manipulation of API functionality.

According to the CVSS v3.1 score, the vulnerability has a base score of 5.4, indicating a medium severity with low attack complexity but requiring some privileges.

The impact includes limited confidentiality and integrity loss, but no impact on availability.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Mattermost Go module github.com/mattermost/mattermost/server/public to version 0.1.22 or later, as versions prior to v0.1.22 fail to validate path parameters properly.

Additionally, stay informed about security updates by subscribing to Mattermost's Security Bulletin for fix release notifications.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-13426. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart