What’s Vulnerable › Vulnerabilities

CVE-2013-10051: InstantCMS <= 1.6 Remote PHP Code Execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-08-01 · updated 2026-06-16
• Weakness: CWE-95

Description

A remote PHP code execution vulnerability exists in InstantCMS version 1.6 and earlier due to unsafe use of eval() within the search view handler. Specifically, user-supplied input passed via the look parameter is concatenated into a PHP expression and executed without proper sanitation. A remote attacker can exploit this flaw by sending a crafted HTTP GET request with a base64-encoded payload in the Cmd header, resulting in arbitrary PHP code execution within the context of the web server.

Affected products

• InstantCMS: through 1.6.0

References

• https://packetstorm.news/files/id/122176
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/instantcms_exec.rb
• https://www.exploit-db.com/exploits/26622
• https://www.vulncheck.com/advisories/instantcms-remote-php-code-execution
• https://www.exploit-db.com/exploits/26622

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