ApostropheCMS Apostrophe up to 3.6.1 Import-Export gzip.js _id/name/extension path traversal

Summaryinfo

A vulnerability, which was classified as problematic, was found in ApostropheCMS Apostrophe up to 3.6.1. This impacts an unknown function of the file packages/import-export/lib/formats/gzip.js of the component Import-Export Module. Such manipulation of the argument _id/name/extension leads to path traversal. This vulnerability is referenced as CVE-2026-63667. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in ApostropheCMS Apostrophe up to 3.6.1. It has been rated as problematic. Affected by this issue is some unknown functionality of the file packages/import-export/lib/formats/gzip.js of the component Import-Export Module. The manipulation of the argument _id/name/extension with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

ApostropheCMS is an open-source Node.js content management system. Prior to 3.6.2, the import-export module in packages/import-export/lib/formats/gzip.js constructs an attachment source path from the attacker-controlled _id, name, and extension fields in aposAttachments.json without ensuring that the resolved path remains under the extracted attachments directory, allowing an authenticated contributor to import a crafted archive, read a host file with an allowed extension, and publish the copied file at an unauthenticated uploads URL. This issue is fixed in version 3.6.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-63667 since 07/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.6.2 eliminates this vulnerability.

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Productinfo

Vendor

• ApostropheCMS

Name

• Apostrophe

Version

• 3.6.0
• 3.6.1

Website

• Product: https://github.com/apostrophecms/apostrophe/

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