CVE Catalog

CVE-2026-103592

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.18%

7th percentile - higher than 7% of all known CVEs

Summary

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.

Risk Assessment

Unauthenticated attackers can gain access to routes protected by IP restrictions, bypassing access control mechanisms. Affects confidentiality and integrity of the system.

Recommendation

Update simple-php-router to the version containing the fix. Configure the proxy server not to trust X-Forwarded-For, CF-Connecting-IP, and Client-IP headers from clients.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS