RCE in Opencats
CVE-2026-27760
OpenCATS prior to commit 3002a29 contains a PHP code injection vulnerability in the installer AJAX endpoint that allows unauthenticated attackers to execute arbitrary code by injecting PHP statements into the databaseConnectivity action parameter. Attackers can break out of the define() string context in config.php using a single quote and statement separator to inject malicious PHP code that persists and executes on every subsequent page load when the installation wizard remains incomplete.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.346 (98.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Opencats — versions 0, 3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (related)
- disclosure@vulncheck.com (related)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-27760?
- CVE-2026-27760 is a high-severity vulnerability in Opencats, classified under Code Injection. CVSS score: 8.1/10. Published 2026-04-28.
- How severe is CVE-2026-27760?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2026-27760 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.