CVE-2026-56678

Deferred Deferred - Pending Action

Server-Side Request Forgery in 9Router

Publication date: 2026-07-15

Last updated on: 2026-07-16

Assigner: GitHub, Inc.

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.

CVSS Scores

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Meta Information

Published

2026-07-15

Last Modified

2026-07-16

Generated

2026-08-05

AI Q&A

2026-07-16

EPSS Evaluated

2026-08-03

NVD

CVE-2026-56678

Affected Vendors & Products

Vendor	Product	Version / Range
9router	9router	to 0.5.6 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

This vulnerability affects 9Router versions prior to 0.5.6. It involves an API-key validation endpoint that uses a user-controlled region value to build an upstream URL. An attacker can manipulate this region value with a crafted input like kiro-canary.local:8443# to redirect the request to a malicious host while sending the user's Kiro API key in the Authorization header.

Detection Guidance

To detect this vulnerability, inspect network traffic for requests to POST /api/oauth/kiro/api-key with unusual region values containing hostnames or ports (e.g., kiro-canary.local:8443#). Check if the Authorization header is forwarded to unexpected destinations. Monitor logs for 9Router versions prior to 0.5.6.

Impact Analysis

An attacker could steal your Kiro API key by tricking the router into sending it to a server they control. This could lead to unauthorized access to your account or services protected by that API key.

Compliance Impact

This vulnerability may lead to unauthorized access to sensitive data, potentially violating GDPR or HIPAA requirements for data protection and access control. Organizations using affected versions could face compliance violations.

Mitigation Strategies

Update 9Router to version 0.5.6 or later to fix the vulnerability. Ensure the Kiro API-key validation endpoint no longer accepts user-controlled region values that could redirect requests.

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