Labstack Echo up to 4.15.1/5.1.0 Redirect Middleware Context.Scheme redirect

Summaryinfo

A vulnerability was found in Labstack Echo up to 4.15.1/5.1.0. It has been declared as problematic. This affects the function Context.Scheme of the component Redirect Middleware. Such manipulation of the argument X-Forwarded-Proto/X-Forwarded-Protocol/X-Url-Scheme leads to redirect. This vulnerability is referenced as CVE-2026-118658. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Labstack Echo up to 4.15.1/5.1.0. It has been rated as problematic. Affected by this issue is the function Context.Scheme of the component Redirect Middleware. The manipulation of the argument X-Forwarded-Proto/X-Forwarded-Protocol/X-Url-Scheme with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

Echo is a Go web framework. Prior to 4.15.2 and 5.1.1, Context.Scheme returns values from X-Forwarded-Proto, X-Forwarded-Protocol, or X-Url-Scheme without validating that they are supported web schemes. WWWRedirect and NonWWWRedirect use that value to construct a Location header, so an attacker controlling a forwarded scheme header can cause a redirect to use an arbitrary URI scheme. Exploitation requires an affected redirect middleware and user interaction with the response; the HTTPS-specific redirect variants hardcode HTTPS and are unaffected. This issue is fixed in 4.15.2 and 5.1.1.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-118658 since 10/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 373700 (Linux Distros Unpatched Vulnerability : CVE-2026-118658), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.15.2 or 5.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (373700). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Labstack

Name

• Echo

Version

• 4.15.0
• 4.15.1
• 5.0
• 5.1.0

Website

• Product: https://github.com/labstack/echo/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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