CVE-2026-32731: Apostrophecms Import-export path traversal (CVSS 9.9)

Description

ApostropheCMS is an open-source content management framework. Prior to version 3.5.3 of `@apostrophecms/import-export`, The `extract()` function in `gzip.js` constructs file-write paths using `fs.createWriteStream(path.join(exportPath, header.name))`. `path.join()` does not resolve or sanitise traversal segments such as `../`. It concatenates them as-is, meaning a tar entry named `../../evil.js` resolves to a path outside the intended extraction directory. No canonical-path check is performed before the write stream is opened. This is a textbook Zip Slip vulnerability. Any user who has been granted the Global Content Modify permission — a role routinely assigned to content editors and site managers — can upload a crafted `.tar.gz` file through the standard CMS import UI and write attacker-controlled content to any path the Node.js process can reach on the host filesystem. Version 3.5.3 of `@apostrophecms/import-export` fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Apostrophecms Import-export< 3.5.3

Remediation

Fixed in

Apostrophecms Import-export≥ 3.5.3

Patch & vendor advisories

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mwxc-m426-3f78

References

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-mwxc-m426-3f78ExploitVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-32731 being actively exploited?

CVE-2026-32731 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-32731?

CVE-2026-32731 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-32731?

Affected products include Apostrophecms Import-export.

How do I fix CVE-2026-32731?

Upgrade affected software to a fixed version, for example Apostrophecms Import-export 3.5.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-32731 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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