CVE-2026-118652

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{"bugzilla": {"description": "github.com/labstack/echo: Echo: Reflected Cross-Site Scripting via unvalidated JSONP callback", "id": "2563159", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563159"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["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.", "A flaw was found in Echo. When handling JSON with Padding (JSONP) responses, the framework concatenates callback values without proper validation or escaping. If an application exposes an endpoint that passes untrusted input into the callback parameter, a remote attacker can conduct a reflected Cross-Site Scripting (XSS) attack to execute arbitrary script within the victim's browser."], "name": "CVE-2026-118652", "public_date": "2026-10-28T19:35:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118652\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118652\nhttps://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1\nhttps://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af\nhttps://github.com/labstack/echo/releases/tag/v4.16.0\nhttps://github.com/labstack/echo/releases/tag/v5.4.0\nhttps://github.com/labstack/echo/security/advisories/GHSA-h9g5-28mm-hx3g"], "statement": "This vulnerability is rated as Moderate severity because exploitation requires victim interaction through a reflected payload and only affects services configured to return JSONP with attacker-controllable callback arguments. In standard Red Hat environments, the Echo framework is not deployed as an independent service but consumed as an internal library in specific Go applications. Services that do not implement JSONP endpoints or that sanitize incoming callback parameters are not vulnerable.", "threat_severity": "Moderate"}

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