Unauthenticated LLM proxy access via rewrite bypass
Published Jul 10, 2026 · Updated Jul 10, 2026
Authorization bypass in Decolua 9Router before 0.5.2 allows remote attackers to access its LLM proxy without an API key. The guard checks the original path but omits /codex before Next.js rewrites that path to the protected /api/v1/responses handler. A network-reachable instance is required, and successful requests consume configured provider access through operator-stored credentials.
Summary
What happened
Authorization bypass in Decolua 9Router before 0.5.2 allows remote attackers to access its LLM proxy without an API key. The guard checks the original path but omits /codex before Next.js rewrites that path to the protected /api/v1/responses handler. A network-reachable instance is required, and successful requests consume configured provider access through operator-stored credentials.
The record
- CVE
- CVE-2026-55638
- Published
- Jul 10, 2026
- Updated
- Jul 10, 2026
- Vendor
- Decolua
- Product
- 9Router
- Classifications
- CWE-863, CWE-862, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 10, 2026CVE publishedPublication date reported by the CVE source.
- Jul 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-8gmq-j984-vp4r HTTP proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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