Incomplete Blacklist Vulnerability in PbootCMS File Upload by Pboot
CVE-2026-4509

5.3MEDIUM

Key Information:

Vendor

Pboot

Status
Pbootcms
Vendor
CVE Published:
21 March 2026

Badges

๐Ÿ‘พ Exploit Exists๐ŸŸก Public PoC

What is CVE-2026-4509?

A security flaw has been identified in PbootCMS, specifically within the file upload module located in core/function/file.php. This vulnerability relates to an incomplete blacklist implementation in the argument handling, which can be exploited remotely. Attackers can manipulate file uploads, potentially leading to unauthorized access or execution of malicious payloads. With public exploits already released, it's critical for users to promptly address this vulnerability by updating to secure versions.

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Deploy the Patch

Affected Version(s)

PbootCMS 3.2.0

PbootCMS 3.2.1

PbootCMS 3.2.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4509 - Proof of Concept

References

https://vuldb.com/?id.352075
vdb-entrytechnical-description
https://vuldb.com/?ctiid.352075
signaturepermissions-required
https://vuldb.com/?submit.773901
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • ๐ŸŸก

    Public PoC available

  • ๐Ÿ‘พ

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

zmjjkk (VulDB User)
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