Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

CVE-2026-555019router: Login brute-force protection bypass via spoofed X-Forwarded-For header

High 7.3

In plain English

A high-severity security flaw in 9router from decolua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.4%top 67.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	9router	0.4.77	GHSA-7cfm-pqrj-xgq7

Affected products (as reported)

Vendor	Product	Versions
decolua	9router	< 0.4.80

Weakness: CWE-307 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

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