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CVE-2026-55501 is a brute-force protection bypass in 9Router affecting versions prior to 0.4.80. The dashboard login rate limiter in src/lib/auth/loginLimiter.js derives client identity from the X-Forwarded-For HTTP header, and the login handler in src/app/api/auth/login/route.js uses that attacker-controlled value for failed-login tracking and lockout decisions through checkLock and recordFail. Because X-Forwarded-For is spoofable when not derived from a trusted proxy chain, a remote attacker can vary the header value on each authentication attempt to obtain a new rate-limit bucket and evade the intended five-attempt threshold and progressive lockout behavior. The flaw enables unrestricted password guessing against the dashboard authentication interface.
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Cross-references every affected SKU, including bundled OEM variants.
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