The vDesk HangupPHP3 exploit serves as a cautionary tale about the dangers of mixing asynchronous signals with stateful session management in PHP. While the affected software version is aging, thousands of call centers and MSPs still run unpatched instances due to custom integrations.
Remote attackers can execute arbitrary actions via XSS. vdesk hangupphp3 exploit
The attacker first authenticates to the vDesk portal as a low-privileged user (e.g., a support agent). The system creates a PHP session file containing the user's ID, call queue status, and telephony handles. The vDesk HangupPHP3 exploit serves as a cautionary
Several documented incidents in 2022–2024 show threat actors exploiting this vulnerability to deploy cryptocurrency miners on MSP helpdesk servers. call queue status
If your vDesk version is end-of-life, you can hot-patch hangup.php3 by adding at the top: