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CVE-2026-94131 – Unauthenticated Arbitrary File Deletion – AcyMailing Enterprise extension for Jooml

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Summary

CVE-2026-94131 is an unauthenticated arbitrary file deletion vulnerability in the AcyMailing Enterprise extension for Joomla, affecting versions 1.0.0 through 11.0.5. A subscriber-supplied path stored in a file-type custom field is used by AcyMailing to delete a file when that field is later cleared, without verifying the path stays inside the extension’s designated upload folder. The issue carries a CVSS score of 8.3 (High) and requires no authentication, allowing an attacker to delete arbitrary files on the server, including the site’s configuration.php.

Technical details

  • Root cause: AcyMailing lets a subscriber set the value of a file-type custom field to an arbitrary file path rather than restricting it to a path produced by a genuine file upload.
  • Trigger condition: When the custom field is subsequently cleared, AcyMailing deletes the file at the stored path without validating that the path resolves to a location inside the upload folder.
  • Attack vector: Network-based; the flaw is reachable through subscriber-facing functionality of the Enterprise edition and does not require prior authentication.
  • Impact: Deletion of arbitrary files outside the intended upload directory, including critical files such as configuration.php, which can disrupt site availability and potentially expose the site to further compromise.

Affected software

  • AcyMailing Enterprise extension for Joomla, versions 1.0.0 through 11.0.5

Severity

  • CVSS v4.0 Base Score: 8.3 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade AcyMailing to version 11.1.0 or later, which restricts file-type custom field values to genuine uploads, applies basename() and filename validation, and verifies the resolved path stays inside the upload directory before writing or deleting.
  • If patching is not immediately possible: Restrict or disable subscriber-facing custom field submission forms that expose file-type fields, monitor for unexpected deletions of core files such as configuration.php, and ensure recent backups of the Joomla installation are available for rapid recovery.

References

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