CVE-2026-73663: FreePBX: Unauthenticated SQL injection in FreePBX missedcall via inbound Caller ID name leads to administrator takeover
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 2026-11-04 15:41 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 16.0.0 until 16.0.11 and 17.0.4, the FreePBX missedcall module places the inbound Caller ID name from crafted SIP From headers into the missedcalllog INSERT in agi-bin/missedcallnotify.php without escaping or bound parameters. An unauthenticated caller can inject SQL when a monitored extension goes unanswered, corrupting the database and modifying FreePBX administrator accounts to obtain unauthorized remote access. This issue is fixed in versions 16.0.11 and 17.0.4.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-08-13).
Weakness: CWE-89: Improper Neutralization of Special Elements used in an SQL Command (‘SQL Injection’)
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. 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
- 0.004
low predicted chance of attack - VEDAS
- 0.986
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| FreePBX missedcall | version < 16.0.11 version >= 17.0.1, < 17.0.4 | 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-2026-73663 FreePBX - SQL Injection. Add them to your Suricata rule set and reload.
Show the rules
alert sip $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2026-73663 FreePBX - SQL Injection"; flow:to_server; content:"INVITE"; depth:6; content:"From|3a|"; nocase; pcre:"/From\x3a[^\r\n]*\x27[^\r\n]*(select|union|sleep|concat|benchmark|\x2d\x2d|\x3b)/i"; classtype:attempted-admin; reference:cve,CVE-2026-73663; reference:url,https://www.exploit.observer/?keyword=CVE-2026-73663&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=freepbx&match=exact; sid:1079002; rev:1;)
CVE-2026-73663.rules on GitHub
References
Other references
- https://github.com/FreePBX/security-reporting/security/advisories/GHSA-g27h-xf3q-h3rm (x_refsource_CONFIRM)
- https://github.com/FreePBX/missedcall/commit/4ada1d6b280fc246e74babc8d52f4cd1509eff24 (x_refsource_MISC)
- https://github.com/FreePBX/missedcall/commit/710acdf51968db507b3f9c47ce3db006846cf44c (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.
Supporting partners
