CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/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
Lifecycle Timeline
2DescriptionNVD
next-intl provides internationalization for Next.js. Applications using the next-intl middleware prior to version 4.9.1with localePrefix: 'as-needed' could construct URLs where path handling and the WHATWG URL parser resolved a relative redirect target to another host (e.g. scheme-relative // or control characters stripped by the URL parser), so the middleware could redirect the browser off-site while the user still started from a trusted app URL. The problem has been patchedin [email protected].
AnalysisAI
Open redirect vulnerability in next-intl middleware prior to version 4.9.1 allows remote attackers to craft malicious URLs that bypass path handling validation when localePrefix: 'as-needed' is configured, redirecting users to arbitrary hosts via scheme-relative URLs or control characters that the WHATWG URL parser strips. Unauthenticated attackers can exploit this through social engineering (phishing links) to redirect users from trusted application URLs to attacker-controlled domains. …
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External POC / Exploit Code
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