CVE-2026-118650: Auth Bypass (CVSS 7.5)

Description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, a globally mounted middleware.Static instance can interpret an encoded request path differently from Echo's router because the router matches the still-encoded path while the static handler uses the decoded URL.Path. The advisory demonstrates an encoded slash resolving to a file under the static root through the global static middleware, but the source is internally inconsistent about whether a route or group guard protects the corresponding literal path in that global-mount configuration. This issue is fixed in 4.16.0 and 5.4.0.

Is your site exposed to CVE-2026-118650?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0040

Probability of exploitation

0.34%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-177 CWE-177

CWE-863 Incorrect Authorization

References

Other References

https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af https://github.com/labstack/echo/releases/tag/v4.16.0 https://github.com/labstack/echo/releases/tag/v5.4.0 https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4

Frequently Asked Questions

What is CVE-2026-118650? +

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, a globally mounted middleware.Static instance can interpret an encoded request path differently from Echo's router because the router matches the still-encoded path while the static handler uses the decoded URL.Path. The advisory demonstrates an encoded slash resolving to a file under the static root through the global static middleware, but the source is internally inconsistent about whether a route or group guard protects the corresponding literal path in that global-mount configuration. This issue is fixed in 4.16.0 and 5.4.0. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-118650? +

CVE-2026-118650 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0040, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-118650? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-23983

Improper handling of canonical URL-encoding may lead to bypass not properly constrained by request rules.

CVE-2026-76504 9.8

A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to …

CVE-2026-41041 9.1

URL path injection via unencoded user-supplied identifiers vulnerability in Apache Gravitino. This issue affects Apache Gravitino: from 1.0.0 before 1.2.1. …

CVE-2026-59083 9.1

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. …

CVE-2026-100409 7.5

OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware …

CVE-2026-76172 7.5

fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and …