CVE-2026-44666: ZELON88 HRCONVERT2

Critical severity, CVSS 9.3. EPSS: 0.5% chance of exploitation in the next 30 days.

HRConvert2 is a self-hosted, drag-and-drop & nosql file conversion server & share tool. Prior to 3.3.8, the sanitizeString() function in convertCore.php is missing backtick (`) and tab (\t) from its strip list. User input then reaches shell_exec(), where the shell interprets these characters and commands within filenames execute. This vulnerability is fixed in 3.3.8.

Affected products

• ZELON88 HRCONVERT2: before 3.3.8 (fixed in 3.3.8)

Published 2026-05-14. Last modified 2026-06-17.