Unauthenticated file upload via disabled extension validation
Published Jul 17, 2026 · Updated Jul 17, 2026
Unrestricted file upload in Feng Office 3.11.13.11 allows remote attackers to place dangerous files in its web-accessible /tmp/ directory. The standalone ck_upload_handler.php endpoint performs no authentication, leaves its extension allowlist commented out, and copies the supplied file into /tmp/. No user interaction is required for upload; uploaded HTML can execute script when an administrator opens it, exposing a non-HttpOnly session cookie.
Summary
What happened
Unrestricted file upload in Feng Office 3.11.13.11 allows remote attackers to place dangerous files in its web-accessible /tmp/ directory. The standalone ck_upload_handler.php endpoint performs no authentication, leaves its extension allowlist commented out, and copies the supplied file into /tmp/. No user interaction is required for upload; uploaded HTML can execute script when an administrator opens it, exposing a non-HttpOnly session cookie.
The record
- CVE
- CVE-2026-36669
- Published
- Jul 17, 2026
- Updated
- Jul 17, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 17, 2026CVE publishedPublication date reported by the CVE source.
- Jul 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
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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
- CVE-2026-36669 Feng Office upload proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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