CVE-2021-47753
CRITICAL
2026-01-15
[email protected]
9.8
CVSS 3.1
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CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Lifecycle Timeline
3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 23, 2026 - 18:31 vuln.today
Public exploit code
CVE Published
Jan 15, 2026 - 16:16 nvd
CRITICAL 9.8
Description
phpKF CMS 3.00 Beta y6 contains an unauthenticated file upload vulnerability that allows remote attackers to execute arbitrary code by bypassing file extension checks. Attackers can upload a PHP file disguised as a PNG, rename it, and execute system commands through a crafted web shell parameter.
Analysis
phpKF CMS 3.00 Beta allows unauthenticated PHP file upload by disguising it as a PNG, then renaming it for execution. PoC available.
Technical Context
File upload check can be bypassed by uploading PHP as PNG then renaming (CWE-434).
Affected Products
phpKF CMS 3.00 Beta y6
Remediation
Do not use this software in production.
Priority Score
69
Low
Medium
High
Critical
KEV: 0
EPSS: +0.3
CVSS: +49
POC: +20
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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