CVE-2026-73660: FreePBX Tts

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

FreePBX is an open source IP PBX. Prior to 16.0.6 and 17.0.5.4, the FreePBX Text-To-Speech module allows an authenticated administrator to save a TTS destination name that is HTML-encoded for storage, decoded during dialplan generation, passed as an AGI argument, and used to build filenames inside agi-bin/propolys-tts.agi. The TTS destination name reaches a raw shell-command execution path, allowing arbitrary operating-system command execution as the asterisk service user. This issue is fixed in versions 16.0.6 and 17.0.5.4.

Affected products

• FreePBX Tts: before 16.0.6 (fixed in 16.0.6); from 17.0.1, before 17.0.5.4 (fixed in 17.0.5.4)

Published 2026-08-13. Last modified 2026-09-18.