EUVD-2026-38378
GHSA-g898-grjx-8jm3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable open redirect requiring passive user interaction; scope changes to attacker origin enabling OAuth code theft; no privileges required and no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Nuxt versions 4.0.0 before 4.4.7 and 3.x before 3.21.7 accept protocol-relative paths such as //evil.com in the reloadNuxtApp function; these pass the script-protocol check but resolve to a cross-origin URL against the current page protocol. Attackers can inject paths like //evil.com to redirect users to attacker-controlled hosts, enabling phishing and OAuth authorization-code theft.
AnalysisAI
Open redirect in Nuxt 3.x before 3.21.7 and 4.x before 4.4.7 allows remote unauthenticated attackers to redirect victims to arbitrary external hosts by supplying protocol-relative paths such as //evil.com to the reloadNuxtApp composable. The function's only security gate checks whether the resolved URL's scheme is a script protocol; protocol-relative paths inherit the page's own scheme (https:), pass that check, and are then written directly to window.location.href. The practical consequence is phishing and OAuth authorization-code theft on any application that forwards user-controlled input into reloadNuxtApp. No public exploit has been identified at time of analysis and no CISA KEV listing exists, but the GHSA advisory notes this is part of a broader cluster of three URL-handling weaknesses in Nuxt's navigation APIs.
Technical ContextAI
Nuxt is a Vue.js-based full-stack meta-framework distributed as the nuxt npm package (CPE: cpe:2.3:a:nuxt:nuxt:*:*:*:*:*:*:*:*). The vulnerable code path is in packages/nuxt/src/app/composables/chunk.ts inside the reloadNuxtApp function. The pre-patch logic constructed a URL object via new URL(path, window.location.href) and checked only the resolved .protocol property against a isScriptProtocol allowlist. WHATWG URL parsing defines protocol-relative references (paths beginning with //) as having no scheme of their own; when resolved against a base URL, they adopt the base's scheme but independently set the host component. Thus new URL('//evil.com', 'https://app.example.com').protocol returns 'https:', which is not a script protocol - the check passes - while .host returns 'evil.com'. The fixed code adds url.host !== window.location.host as an explicit gate, closing the bypass. CWE-601 (URL Redirection to Untrusted Site) precisely describes this root cause: failure to validate the host component of a fully-resolved URL before using it as a redirect target.
RemediationAI
Upgrade to Nuxt 4.4.7 (for the 4.x series) or Nuxt 3.21.7 (for the 3.x series); these versions are confirmed as fixed by the npm package advisories in GHSA-c9cv-mq2m-ppp3 (https://github.com/nuxt/nuxt/security/advisories/GHSA-c9cv-mq2m-ppp3) and by the patch commits e447a793c47766834f7497f8412a76cd56fd8ee1 and 6497d99dd106254abd089f6a263d7773869a343b. If an immediate upgrade is not feasible, audit all application code that supplies user-controlled values (query parameters, form fields, cookies) to reloadNuxtApp({ path }) and add an explicit host comparison guard - reject any path whose resolved host differs from window.location.host - before the framework call. Note that this application-level workaround must be applied to every call site and is fragile; patch upgrade is strongly preferred. Adding WAF rules or CSP navigate-to directives to restrict redirect destinations can serve as a detection or partial-mitigation layer but cannot fully substitute for the code-level fix.
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