CVE-2026-27760Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via installer config injection

Published Apr 28, 2026 · Updated Apr 28, 2026

PHP code injection in OpenCATS 0.9.7.4 and earlier allows remote attackers to execute arbitrary code through the installer AJAX endpoint. CATSUtility::changeConfigSetting writes unescaped databaseConnectivity request values into config.php define statements, allowing injected PHP to persist and execute on page loads. Exploitation requires an incomplete installation without the INSTALL_BLOCK file and grants the web-server process's access.

CVSS severity9.2
Critical
EPSS probability34.63%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP code injection in OpenCATS 0.9.7.4 and earlier allows remote attackers to execute arbitrary code through the installer AJAX endpoint. CATSUtility::changeConfigSetting writes unescaped databaseConnectivity request values into config.php define statements, allowing injected PHP to persist and execute on page loads. Exploitation requires an incomplete installation without the INSTALL_BLOCK file and grants the web-server process's access.

The record

CVE
CVE-2026-27760
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
OpenCATS
Product
OpenCATS
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.9.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenCATS · OpenCATSversion=0 <=0.9.7.4

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.1VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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