Labstack Echo up to 4.15.x/5.3.x JSONP Context.JSONP/Context.JSONPBlob callback cross site scripting

Summaryinfo

A vulnerability was found in Labstack Echo up to 4.15.x/5.3.x and classified as problematic. This affects the function Context.JSONP/Context.JSONPBlob of the component JSONP. Executing a manipulation of the argument callback can lead to cross site scripting. The identification of this vulnerability is CVE-2026-118652. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Labstack Echo up to 4.15.x/5.3.x. This vulnerability affects the function Context.JSONP/Context.JSONPBlob of the component JSONP. The manipulation of the argument callback with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Context.JSONP and Context.JSONPBlob concatenate an unvalidated callback value into a JavaScript response. A route that passes attacker-controlled input as the callback can return executable script syntax, allowing reflected cross-site scripting when a user loads the crafted response. The vulnerable jsonPBlob path performs no callback validation or escaping, and exploitation requires an application route that exposes attacker control over the callback argument. This issue is fixed in 4.16.0 and 5.4.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-118652 since 10/28/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 4.16.0 or 5.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• Labstack

Name

• Echo

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 5.0
• 5.1
• 5.2
• 5.3

Website

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

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