Login lockout bypass via spoofable client-IP header
Published Sep 22, 2026 · Updated Sep 22, 2026
Improper login throttling in Decolua 9Router before 0.5.6 allows remote attackers to perform unthrottled dashboard password guessing. The loginLimiter.js getClientIp function uses client-supplied X-9r-Real-Ip values as keys for checkLock and recordFail, so rotating the header creates a fresh failure bucket for every request. Exploitation requires direct Next.js exposure without the sanitizing custom-server.js wrapper; a recovered password grants an administrative dashboard session.
Summary
What happened
Improper login throttling in Decolua 9Router before 0.5.6 allows remote attackers to perform unthrottled dashboard password guessing. The loginLimiter.js getClientIp function uses client-supplied X-9r-Real-Ip values as keys for checkLock and recordFail, so rotating the header creates a fresh failure bucket for every request. Exploitation requires direct Next.js exposure without the sanitizing custom-server.js wrapper; a recovered password grants an administrative dashboard session.
The record
- CVE
- CVE-2026-56682
- Published
- Sep 22, 2026
- Updated
- Sep 22, 2026
- Vendor
- Decolua
- Product
- 9Router
- Classifications
- T1110.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 22, 2026CVE publishedPublication date reported by the CVE source.
- Sep 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.5.6
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.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
- Vendor rotating-header proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Get started to see how Hinoki identifies affected software and validates exploitability in your environment.
Get started