CVE-2026-73662: Authenticated FreePBX Music RCE via mpg123 and Asterisk Call Files
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-08 00:03 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
FreePBX is an open source IP PBX. From 17.0.1 until 17.0.7, the FreePBX Music on Hold module permits dangerous command-line options for /usr/bin/mpg123 and other allowed players in validateCustomConfiguration() in Music.class.php. An authenticated administrator can use options that write files, open control channels, or create Asterisk call files because applicationUsesDisallowedPlayerOption() does not reject those arguments, resulting in arbitrary command execution as the asterisk service user. This issue is fixed in version 17.0.7.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-08-13).
Weakness: CWE-78: Improper Neutralization of Special Elements used in an OS Command (‘OS Command Injection’)
How it can be exploited
Exploitable over the network with low attack complexity only when specific conditions are present needing low privileges and no user interaction. Impact: confidentiality high, integrity high, availability none. CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 3 code repositories naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 5 references on Exploit Observer
Live scores
- EPSS
- 0.009
low predicted chance of attack - VEDAS
- 0.987
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| FreePBX music | version < 17.0.7 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-73662 FreePBX - Music on Hold Command Execution via mpg123 Player Options. Add them to your Suricata rule set and reload.
Show the rules
# CVE-2026-73662 - FreePBX Music on Hold authenticated command execution:
# validateCustomConfiguration() allows dangerous mpg123/mpg321 player options
# (-w/--wav/--outfile/--streamdump/--fifo/-@/-O ...) that write files or open control channels.
# Detect the custom player 'application' carrying such options in a music-module save.
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-73662 FreePBX - Music on Hold Command Execution via mpg123 Player Options"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"ajax.php"; nocase; fast_pattern; content:"module=music"; nocase; http.request_body; content:"application="; nocase; pcre:"/application=[^&]*mpg(?:123|321)[^&]*(?:\x2d\x2d(?:streamdump|wav|outfile|au|cdr|auth\x2dfile|fifo|network)|(?:\x2b|%20|%2b|\s)\x2d[wO@])/i"; classtype:attempted-admin; reference:cve,CVE-2026-73662; reference:url,https://www.exploit.observer/?keyword=CVE-2026-73662&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=freepbx&match=exact; sid:1093802; rev:1;)
CVE-2026-73662.rules on GitHub
References
Other references
- https://github.com/FreePBX/security-reporting/security/advisories/GHSA-p97w-rq48-p8q2 (x_refsource_CONFIRM)
- https://github.com/FreePBX/music/commit/9f45605982202a34244ff22c4f635af0dfc1a733 (x_refsource_MISC)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
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