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Rate-Limit-Bypass

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high advisory

9router: Login Brute-Force Protection Bypass via Spoofed X-Forwarded-For Header

The 9router dashboard login rate limiter incorrectly uses the attacker-controlled X-Forwarded-For HTTP header to identify clients, leading to a brute-force protection bypass (CVE-2026-55501) that allows attackers to circumvent the lockout mechanism and conduct unlimited password brute-force attempts to gain administrative access.

9router brute-force rate-limit-bypass x-forwarded-for vulnerability web-application
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