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.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| InstantCMS | InstantCMS | <= 1.6 |
References
- https://packetstorm.news/files/id/122176Third Party Advisory
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/instantcms_exec.rbThird Party Advisory
- https://www.exploit-db.com/exploits/26622Exploit
- https://www.vulncheck.com/advisories/instantcms-remote-php-code-executionThird Party Advisory
- https://www.exploit-db.com/exploits/26622Exploit
Timeline
- Published
- Aug 1, 2025
- Last modified
- Jun 16, 2026
- NVD status
- Analyzed