What is CVE-2026-36669?

CVE-2026-36669 is a critical-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-17.

How severe is CVE-2026-36669?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-36669 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in N/a

CVE-2026-36669

An unauthenticated arbitrary file upload vulnerability in ck_upload_handler.php in Feng Office 3.11.13.11 allows remote attackers to upload malicious files (such as .html) to the web-accessible /tmp/ directory.

Vulnerability class: Unrestricted File Upload

EPSS: 0.006 (44.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

firstlax6t/CVE-2026-36669-FengOffice

References

Frequently asked questions

What is CVE-2026-36669?: CVE-2026-36669 is a critical-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-17.
How severe is CVE-2026-36669?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-36669 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.