Vulnerability · Published Sep 30, 2026 · Assigned by VulnCheck
CVE-2026-103592simple-php-router through 5.4.1.7 IP restriction bypass via forwarding headers
Medium 6.5
In plain English
A medium-severity security flaw in simple-router from pecee. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| pecee | simple-router | 0 – through 5.4.1.7 |
Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- GitHub Issue #727 issue-tracking
- https://github.com/skipperbent/simple-php-router/blob/5.4.1.7/src/Pecee/Http/Middleware/IpRestrictAccess.php technical-description
- https://github.com/skipperbent/simple-php-router/blob/5.4.1.7/src/Pecee/Http/Request.php technical-description
- https://github.com/skipperbent/simple-php-router product
- VulnCheck Advisory: simple-php-router through 5.4.1.7 IP restriction bypass via forwarding headers third-party-advisory