CVE-2026-118652
mediumEcho is a Go web framework.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 security-advisories@github.com
- https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af security-advisories@github.com
- https://github.com/labstack/echo/releases/tag/v4.16.0 security-advisories@github.com
- https://github.com/labstack/echo/releases/tag/v5.4.0 security-advisories@github.com
- https://github.com/labstack/echo/security/advisories/GHSA-h9g5-28mm-hx3g security-advisories@github.com