CVE-2026-103592 simple-php-router through 5.4.1.7 IP restriction bypass via forwarding headers
Attackers can bypass IP restrictions in simple-php-router by spoofing forwarding headers, gaining unauthorized access to protected routes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103592?
CVE-2026-103592 is a medium-severity authentication bypass vulnerability in pecee simple-router, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
simple-php-router through 5.4.1.7 contains an IP restriction bypass vulnerability in the IpRestrictAccess middleware that allows remote unauthenticated attackers to bypass IP whitelist and blacklist protections. Attackers can spoof X-Forwarded-For, CF-Connecting-IP, or Client-IP headers to impersonate whitelisted addresses or evade blacklists, gaining access to IP-restricted routes.
Weakness: CWE-348
Which versions are affected by CVE-2026-103592?
How do I fix CVE-2026-103592?
No fix has been published for CVE-2026-103592 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-103592 being exploited?
There is no known exploitation of CVE-2026-103592 in the wild and no public exploit code.
Sources
Also known as GHSA-73j7-rxg8-5ccm.