What’s Vulnerable › Vulnerabilities

CVE-2026-55501: 9router: Login brute-force protection bypass via spoofed X-Forwarded-For header

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-25
• Weakness: CWE-307

Description

9Router is an AI router & token saver. Prior to 0.4.80, the dashboard login rate limiter in src/lib/auth/loginLimiter.js derives the client identity from the attacker-controlled X-Forwarded-For HTTP header, and src/app/api/auth/login/route.js uses that spoofable value for checkLock and recordFail. A remote attacker can rotate the X-Forwarded-For value on each login attempt to receive a fresh rate-limit bucket, bypass the 5-attempt threshold and progressive lockout durations, and perform unlimited brute-force attempts against the dashboard password. This issue is fixed in version 0.4.80.

Affected products

• decolua 9router: before 0.4.80

References

• https://github.com/decolua/9router/commit/7648c3412b403a29f04967c4b4e9725e228791d4
• https://github.com/decolua/9router/releases/tag/v0.4.80
• https://github.com/decolua/9router/security/advisories/GHSA-7cfm-pqrj-xgq7
• https://github.com/decolua/9router/security/advisories/GHSA-7cfm-pqrj-xgq7

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