SQL Injection Vulnerability in PHP Timeclock by SourceForge
CVE-2021-47966

8.8HIGH

Key Information:

Vendor

Timeclock

Status
PHP Timeclock
Vendor
CVE Published:
15 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47966?

PHP Timeclock 1.04 is vulnerable to time-based and boolean-based blind SQL injection due to insufficient input validation in the login_userid parameter of login.php. This allows unauthenticated attackers to execute crafted SQL queries, enabling them to retrieve sensitive information from the database, including employee names and credentials. Attack vectors involve sending specially formulated POST requests utilizing SLEEP functions and RLIKE statements to exploit this vulnerability.

Affected Version(s)

PHP Timeclock 1.04

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-2021-47966 - Proof of Concept

References

https://www.exploit-db.com/exploits/49849
exploit
http://timeclock.sourceforge.net
product
https://sourceforge.net/projects/timeclock/files/PHP%20Ti...
product

CVSS V4

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tyler Butler
.