CVE-2026-73660: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in FreePBX tts
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.
AI Analysis
Technical Summary
FreePBX TTS module versions before 16.0.6 and 17.0.5.4 improperly handle the TTS destination name by HTML-encoding it for storage, decoding it during dialplan generation, and passing it as an AGI argument. This value is then used to construct filenames inside agi-bin/propolys-tts.agi, which leads to a raw shell command execution path. Consequently, an authenticated administrator can execute arbitrary OS commands as the asterisk service user. The vulnerability is identified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command).
Potential Impact
An attacker with authenticated administrator privileges can execute arbitrary operating system commands on the FreePBX server with the permissions of the asterisk service user. This could lead to full system compromise depending on the privileges of that user. The vulnerability is rated with a CVSS 4.0 score of 7.5 (high severity), indicating significant impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in FreePBX versions 16.0.6 and 17.0.5.4. Users should upgrade to these versions or later to remediate the issue. No other mitigation or workaround is indicated in the available data.
CVE-2026-73660: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in FreePBX tts
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.
CVSS v4.0
Score 7.5high
Affected software
FreePBX
tts
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
FreePBX TTS module versions before 16.0.6 and 17.0.5.4 improperly handle the TTS destination name by HTML-encoding it for storage, decoding it during dialplan generation, and passing it as an AGI argument. This value is then used to construct filenames inside agi-bin/propolys-tts.agi, which leads to a raw shell command execution path. Consequently, an authenticated administrator can execute arbitrary OS commands as the asterisk service user. The vulnerability is identified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command).
Potential Impact
An attacker with authenticated administrator privileges can execute arbitrary operating system commands on the FreePBX server with the permissions of the asterisk service user. This could lead to full system compromise depending on the privileges of that user. The vulnerability is rated with a CVSS 4.0 score of 7.5 (high severity), indicating significant impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in FreePBX versions 16.0.6 and 17.0.5.4. Users should upgrade to these versions or later to remediate the issue. No other mitigation or workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-13T14:04:09.605Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7e3a17bf8831d539d7044b
Added to database: 08/13/2026, 21:41:43 UTC
Last enriched: 08/21/2026, 13:06:34 UTC
Last updated: 09/28/2026, 01:47:44 UTC
Views: 55
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.