RCE in Instantcms
CVE-2013-10051
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.028 · change: +0.009
Affected products
- Instantcms — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/u… (Third Party Advisory, exploit)
- www.exploit-db.com/exploits/26622 (Exploit, exploit)
- packetstorm.news/files/id/122176 (Third Party Advisory, exploit)
- www.vulncheck.com/advisories/instantcms-remote-php-code-execution (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2013-10051?
- CVE-2013-10051 is a critical-severity vulnerability in Instantcms, classified under Eval Injection. CVSS score: 9.8/10. Published 2025-08-01.
- How severe is CVE-2013-10051?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2013-10051 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.