File Write Path Vulnerability in ApostropheCMS by Apostrophe
CVE-2026-32731

10CRITICAL

Key Information:

Vendor

Apostrophecms

Status
Import-export
Vendor
CVE Published:
18 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-32731?

ApostropheCMS is an open-source content management framework that has a vulnerability in the @apostrophecms/import-export package prior to version 3.5.3. The vulnerability lies within the extract() function in gzip.js, where file-write paths are constructed using fs.createWriteStream(path.join(exportPath, header.name)). This allows for path traversal since path.join() does not sanitize segments like ../. As a result, an attacker can craft a .tar.gz file containing malicious paths, enabling them to write files outside the intended extraction directory. Users with Global Content Modify permissions, typically site managers and content editors, could exploit this issue to upload and execute unauthorized content on the filesystem, posing a significant security risk.

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Affected Version(s)

import-export < 3.5.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-32731
Created by 0xEr3n

References

https://github.com/apostrophecms/apostrophe/security/advi...
x_refsource_CONFIRM

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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