Detections
Analytics
CVE-2026-118652
medium
Description
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.
References
https://github.com/labstack/echo/security/advisories/GHSA-h9g5-28mm-hx3g
https://github.com/labstack/echo/releases/tag/v5.4.0
https://github.com/labstack/echo/releases/tag/v4.16.0
https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af
https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1