Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-566789Router: Kiro region injection allows authenticated SSRF with Authorization header forwarding

Medium 6.4

In plain English

A medium-severity improper input validation in 9router from decolua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium

Exploit odds (30 days)0.2%top 88.7% 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 0.5.6, the Kiro API-key validation endpoint POST /api/oauth/kiro/api-key builds an upstream URL using a user-controlled region value, allowing an authenticated attacker to supply a crafted region such as kiro-canary.local:8443# and cause 9Router to send the Kiro validation request to an attacker-controlled host while forwarding the submitted Kiro API key as an Authorization header. This issue is fixed in version 0.5.6.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	9router	0.5.6	GHSA-6mwv-4mrm-5p3m

Affected products (as reported)

Vendor	Product	Versions
decolua	9router	< 0.5.6

Weakness: CWE-20, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References

https://github.com/decolua/9router/security/advisories/GHSA-6mwv-4mrm-5p3m x_refsource_CONFIRM
https://github.com/decolua/9router/commit/126aa244c5b51b74ab8c7594e3418fcf4437bf6f x_refsource_MISC
https://github.com/decolua/9router/releases/tag/v0.5.6 x_refsource_MISC