Host file disclosure via attachment-name path traversal
Published Aug 17, 2026 · Updated Aug 17, 2026
Path traversal in the ApostropheCMS import-export module before 3.6.2 allows remote authenticated users to read host files. packages/import-export/lib/formats/gzip.js joins untrusted _id, name, and extension values from aposAttachments.json without verifying that the resolved path remains inside the extracted attachments directory. Contributor access and the optional module are required; the target filename must use an allowed extension, and the copied file is exposed at an unauthenticated uploads URL.
Summary
What happened
Path traversal in the ApostropheCMS import-export module before 3.6.2 allows remote authenticated users to read host files. packages/import-export/lib/formats/gzip.js joins untrusted _id, name, and extension values from aposAttachments.json without verifying that the resolved path remains inside the extracted attachments directory. Contributor access and the optional module are required; the target filename must use an allowed extension, and the copied file is exposed at an unauthenticated uploads URL.
The record
- CVE
- CVE-2026-63667
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Vendor
- ApostropheCMS
- Product
- ApostropheCMS
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.6.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-79qf-vqgc-7xx3 reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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