CVE-2026-27760 in the critical feed json
OpenCATS PHP Code Injection via installer AJAX endpoint
published 2026-04-28 6 mo ago modified 2026-11-08 25 h ago also EUVD-2026-26052
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 33.0%
- EPSS 33.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 1
- Metasploit, plus a Nuclei check
Summary
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.
Patch / fix
- opencats opencats 0.10.0
- github.com/opencats/OpenCATS@3002a29 commit
- github.com/opencats/OpenCATS#706 pull request
Timeline
- First public exploit (Metasploit exploit/multi/http/opencats_installer_rce)
- Published
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
32.98% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/multi/http/opencats_installer_rce OpenCATS Installer PHP Code Injection metasploit exploit, excellent rank, 2026-04-28
- Nuclei template OpenCATS - Command Injection nuclei detection template
- chocapikk.com https://chocapikk.com/posts/2026/opencats-installer-rce/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- opencats OpenCATS
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
github.com
/opencats/OpenCATS/pull/706
issue-tracking, patch
-
github.com
/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
patch
-
chocapikk.com
/posts/2026/opencats-installer-rce/
technical-description, exploit
-
github.com
/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172
related
-
github.com
/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130
related
-
vulncheck.com
/advisories/opencats-php-code-injection-via-installer-ajax-endpoint
third-party-advisory
Sources
- CVE List CVE-2026-27760
- NVD CVE-2026-27760
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.