{"basis":"claimed","id":"CVE-2025-29927","name":"Authorization Bypass in Next.js Middleware","vendorProject":"vercel","product":"next.js","publishedAt":"2025-03-21","cvss":{"score":9.1,"severity":"CRITICAL","version":"3.1"},"exploited":null,"epss":{"score":0.99225,"percentile":0.99936,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"off","firstOn":"2025-03-22","daysToRule":1},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"rule","firstOn":"2025-04-28","daysToRule":38},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"rule","firstOn":"2025-03-31","daysToRule":10}},"title":"Authorization Bypass in Next.js Middleware","description":"Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.","cwes":["CWE-285"],"vendors":[{"vendor":"cloudflare","status":"off","basis":"claimed","firstOn":"2025-03-22","firstIsNew":true,"daysToRule":1,"daysAtMost":null,"freePlan":false,"claims":[{"id":"8e521e71ee854c098cab783255526678c85fedb6352d5a42676cdd2e9a1358f7","cve_id":"CVE-2025-29927","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"34583778093748cc83ff7b38f472013e","rule_name":"Next.js - Auth Bypass - CVE:CVE-2025-29927","change":"new","default_action":"Disabled","published_on":"2025-03-22","source_url":"https://developers.cloudflare.com/changelog/post/2025-03-22-emergency-waf-release/","source_title":"WAF Release - 2025-03-22 - Emergency","excerpt":"Next.js - Auth Bypass - CVE:CVE-2025-29927. Previous action: N/A. New action: Disabled. 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