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CVE-2026-27760

OpenCATS PHP Code Injection via installer AJAX endpoint

No known exploitation. EPSS puts it in the 89th percentile. Fixed in 3002a29f4c3cada1aa2c4f3d4ae4e189906606b6.

CVSS 3.18.1HighEPSS percentile89th3.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix3002a29f4c3cada1aa2c4f3d4ae4e189906606b6Upgrade to this build

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • OpenCATSAffected: ≤ 0.9.7.4Upgrade to: after 0.9.7.4Fixed builds3002a29f4c3cada1aa2c4f3d4ae4e189906606b6Stated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free Nuclei check exists for this CVE. Run it against your hosts.Is your organisation exposed?Discuss checks for your systems with a specialist. Scope is agreed before testing.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS89th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

3.4% chance of exploitation activity in the next 30 days, which ranks it in the 89th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

12 events over 155 days, from the signal feeds we watch.

  1. EPSS band changemoderate → low
  2. EPSS band changemoderate → lowepss band change
  3. Record updated
  4. EPSS band changelow → moderate
  5. EPSS band changelow → moderate
  6. EPSS band changelow → moderate

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 8.1 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 3 more references. See all after sign-in

In the news

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We'll flag the next CVE, public exploit or patch for OpenCATS, not every advisory.