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CVE-2026-54614: CVE-2026-54614: Unsafe Reflection and Arbitrary Class Instantiation in cakephp/debug_kit MailPreview

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CVE-2026-54614: Unsafe Reflection and Arbitrary Class Instantiation in cakephp/debug_kit MailPreview

Vulnerability ID: CVE-2026-54614
CVSS Score: 4.3
Published: 2026-08-26

CVE-2026-54614 is an unsafe reflection vulnerability in the MailPreview component of cakephp/debug_kit prior to versions 4.10.3 and 5.2.4. Unauthenticated or low-privileged remote attackers can exploit this vulnerability to dynamically resolve and instantiate arbitrary PHP classes within the Composer autoloader environment, leading to constructor and destructor execution.

TL;DR

An unsafe reflection flaw in CakePHP's DebugKit toolbar allows remote attackers to instantiate arbitrary PHP classes, potentially triggering remote code execution, database interactions, or denial of service through destructor/constructor side-effects.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-470
  • Attack Vector: Network
  • CVSS v3.1: 4.3 (Medium)
  • Exploit Status: poc
  • KEV Status: Not Listed
  • Impact: Unsafe Reflection / Arbitrary Class Instantiation / Potential Remote Code Execution

Affected Systems

  • Applications utilizing CakePHP Framework with the DebugKit plugin enabled
  • debug_kit: < 4.10.3 (Fixed in: 4.10.3)
  • debug_kit: >= 5.0.0, < 5.2.4 (Fixed in: 5.2.4)

Code Analysis

Commit: c8a2a9e

Fix unsafe reflection in MailPreviewController (5.x)

Commit: 7c4d85e

Backport MailPreview reflection security fixes to 4.x branch

Exploit Details

  • GitHub: Exploit concepts and validation test cases within the official security pull request

Mitigation Strategies

  • Upgrade cakephp/debug_kit to version 4.10.3 or 5.2.4.
  • Enforce development environment isolation by executing composer installations with the --no-dev flag in production.
  • Ensure CakePHP debug mode is explicitly set to false in all public environments.
  • Deploy Web Application Firewall (WAF) rules to detect and drop requests containing directory separators or namespace backslashes inside DebugKit URI paths.

Remediation Steps:

  1. Run 'composer update cakephp/debug_kit' to fetch the secure versions.
  2. Validate that the installed version in composer.lock is at least 4.10.3 or 5.2.4.
  3. Verify production environments have 'debug' configuration set to false.
  4. Configure web servers to reject requests containing backslash (%5C) sequences pointing to DebugKit paths.

References

Read the full report for CVE-2026-54614 on our website for more details including interactive diagrams and full exploit analysis.

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