Vulnerability-Lookup

GHSA-H957-4JFH-QC3P

Vulnerability from github – Published: 2026-04-28 15:30 – Updated: 2026-04-28 15:30

Details

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.

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

9.2 (Critical)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-27760"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-28T15:16:26Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-h957-4jfh-qc3p",
  "modified": "2026-04-28T15:30:51Z",
  "published": "2026-04-28T15:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27760"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencats/OpenCATS/pull/706"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6"
    },
    {
      "type": "WEB",
      "url": "https://chocapikk.com/posts/2026/opencats-installer-rce"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-27760 (GCVE-0-2026-27760)

Vulnerability from cvelistv5 – Published: 2026-04-28 13:43 – Updated: 2026-07-14 18:39

Title

OpenCATS PHP Code Injection via installer AJAX endpoint

Summary

Severity

9.2 (Critical)


                        
                          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

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-28 14:55 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://chocapikk.com/posts/2026/opencats-install…	technical-descriptionexploit
https://github.com/opencats/OpenCATS/pull/706	issue-tracking
https://github.com/opencats/OpenCATS/commit/3002a…	patch
https://github.com/opencats/OpenCATS/blob/46e4727…	related
https://github.com/opencats/OpenCATS/blob/46e4727…	related
https://www.vulncheck.com/advisories/opencats-php…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
opencats	OpenCATS	Affected: 0 , ≤ 0.9.7.4 (custom) Unaffected: 3002a29f4c3cada1aa2c4f3d4ae4e189906606b6 (git) cpe:2.3:a:opencats:opencats::::::::

Credits

Valentin Lobstein (Chocapikk) VulnCheck

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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GHSA-H957-4JFH-QC3P

CVE-2026-27760 (GCVE-0-2026-27760)

Tags

Sightings

Nomenclature

Related by attack behaviour