Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M

CVE-2026-63667ApostropheCMS: Arbitrary file read via import-export attachment-name path traversal

Medium 6.5

In plain English

A medium-severity path traversal in apostrophe from apostrophecms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 59.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@apostrophecms/import-export	3.6.2	GHSA-79qf-vqgc-7xx3

Affected products (as reported)

Vendor	Product	Versions
apostrophecms	apostrophe	< 3.6.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-79qf-vqgc-7xx3 x_refsource_CONFIRM
https://github.com/apostrophecms/apostrophe/commit/87cccf44a23d09420875ca8a3765eb3db843836a x_refsource_MISC
https://github.com/apostrophecms/apostrophe/discussions/5516 x_refsource_MISC