# CVE-2026-56682: 9Router has a Login Brute-Force Lockout Bypass via Spoofable X-9r-Real-Ip Header

Source: https://junglewise.ai/threats/cve-2026-56682-9router-login-brute-force-lockout-bypass-via-spoofable-header  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-56682 · Severity: medium · CVSS 5.3 · Published 2026-09-22

9Router is a popular open-source tool that provides a dashboard login interface for managing API proxy and provider settings. The login endpoint enforces rate-limiting to prevent brute-force password guessing, but this protection can be completely bypassed by manipulating a request header. An attacker can make unlimited login attempts from a single network location by rotating the spoofed header value, allowing them to recover the dashboard password and gain administrative access to all API endpoints and provider configurations.

Technologies: [9router (npm)](https://junglewise.ai/threats/technologies/9router). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-56682 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56682 being exploited in the wild.

**How severe is CVE-2026-56682?** Medium severity, with a CVSS score of 5.3, published 22 September 2026.

**Which products and versions are affected?** 9router (npm) <= 0.5.4, SEMVER:introduced=0,fixed=0.5.8.

**Is there a fix for CVE-2026-56682?** Yes. 9router (npm): upgrade to 0.5.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56682 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-56682?** Check whether you run 9router (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- 9router (npm): upgrade to 0.5.8 or later

  ```sh
  npm install 9router@0.5.8
  ```


## Technical details

The vulnerability is a brute-force protection bypass (CWE-307, CWE-807) in the login rate-limiter. The getClientIp() function in src/lib/auth/loginLimiter.js reads the client IP directly from the X-9r-Real-Ip HTTP header instead of the transport-layer socket address. While the design assumes this header is set only by a trusted custom-server.js wrapper, in deployment modes where Next.js is accessed directly (not through the wrapper), the attacker controls this header. Since the lockout mechanism is per-IP bucket and each distinct header value creates a new bucket, rotating the header value with each password guess keeps every counter below the 5-attempt threshold, bypassing the 30+ second lockout (HTTP 429). Exploitation requires network access to the login endpoint (default bind 0.0.0.0); no authentication or user interaction is needed. A recovered password grants full administrative access to the 9Router dashboard and its APIs. The issue is fixed in version 0.5.8 by deriving the rate-limit key from req.socket.remoteAddress instead of the header.

## Affected products

- decolua 9Router 0.5.4 and earlier; fixed in 0.5.8

## Identifiers

- CVE-2026-56682
- GHSA-32gc-64m7-hj7v

## Timeline

- 2026-09-22: disclosed: GHSA-32gc-64m7-hj7v published on GitHub Security Advisory database
- 2026-09-22: patched: Fix released in 9Router version 0.5.8 (commit efd20be8d81ef2e256a7037f3aa78e6b567b5fd3)

## References

- [https://github.com/decolua/9router/security/advisories/GHSA-32gc-64m7-hj7v](https://github.com/decolua/9router/security/advisories/GHSA-32gc-64m7-hj7v)
- [https://github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3](https://github.com/decolua/9router/commit/efd20be8d81ef2e256a7037f3aa78e6b567b5fd3)
- [https://github.com/decolua/9router](https://github.com/decolua/9router)
- [https://github.com/decolua/9router/releases/tag/v0.5.6](https://github.com/decolua/9router/releases/tag/v0.5.6)

## Related threats

- [9Router has an Authentication Bypass in Public LLM API via Spoofable X-9r-Real-Ip Header](https://junglewise.ai/threats/cve-2026-56681-9router-authentication-bypass-in-public-llm-api-via-spoofable-x)
- [9Router unauthenticated server-side request forgery in OIDC test endpoint](https://junglewise.ai/threats/cve-2026-56677-9router-unauthenticated-server-side-request-forgery-in-oidc-test)
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- [decolua 9router authentication bypass via Host header spoofing](https://junglewise.ai/threats/cve-2026-49353-decolua-9router-authentication-bypass-via-host-header-spoofing)