ApostropheCMS Authentication and XSS

Path traversal in ApostropheCMS import-export module allows authenticated users with content modification permissions to write files outside the intended export directory via malicious archive entries containing directory traversal sequences. An attacker with editor-level access can exploit this vulnerability to overwrite arbitrary files on the system with CVSS 9.9 critical severity. No patch is currently available for this vulnerability affecting Node.js environments.

A MongoDB query logic error in ApostropheCMS versions 3.0.0 through 4.27.1 allows complete bypass of multi-factor authentication (MFA/TOTP) protections. An attacker with knowledge of a victim's password can use an incomplete bearer token (returned after password verification but before MFA completion) to gain fully authenticated API access without providing TOTP codes. A proof-of-concept demonstration is included in the vulnerability report, and while no public KEV listing exists, the technical details and working POC make this immediately exploitable.