CVE-2026-73665

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (24th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

FreePBX is an open source IP PBX. Prior to 17.0.9, the UCP Node server on ports 8001 and 8003 uses io.use(checkAuth) in node/lib/server.js, but Socket.IO version 4 applies that middleware only to the default namespace. An unauthenticated client can connect to custom namespaces that do not consistently invoke checkAuth in node/lib/auth.js and send crafted event values containing carriage-return or newline characters through the Asterisk Manager Interface action path patched by node/lib/asterisk-manager-patch.js, allowing arbitrary commands to execute as the asterisk service user. This issue is fixed in version 17.0.9.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 13, 2026

Last Modified

October 9, 2026

Advisory Details (1)

Auto-updated Oct 9, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

Unauthenticated remote code execution in FreePBX UCP via socket.io namespace auth bypass and AMI action injection · Advisory · FreePBX/security-reporting · GitHub

https://github.com/FreePBX/security-reporting/security/advisories/GHSA-37j8-fhxx-9vhp

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 52× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 114 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 16 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 01:43 UTCEG score recompute
  2. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-12 21:54 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-10-09 19:34 UTCEG score recompute▲ 0.50
  13. 2026-10-09 19:34 UTCNVD updateCVSS v3 → 9.8
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-09-30 21:43 UTCEG score recompute
  3. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  5. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  9. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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  12. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  15. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  30. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  35. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-09-09 04:51 UTCEG score recompute
  37. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-09-07 16:27 UTCEG score recompute
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  40. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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  44. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  45. 2026-09-02 22:59 UTCEG score recompute
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  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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  56. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-08-27 14:41 UTCEG score recompute
  58. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-26 18:43 UTCEG score recompute
  60. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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  73. 2026-08-18 17:12 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-73665?
CVE-2026-73665 is a critical-severity vulnerability; its CVE record was published on August 13, 2026. FreePBX is an open source IP PBX. Prior to 17.0.9, the UCP Node server on ports 8001 and 8003 uses io.use(checkAuth) in node/lib/server.js, but Socket.IO version 4 applies that middleware only to the default namespace. An unauthenticated client can connect to custom namespaces that do not…
When was the CVE record for CVE-2026-73665 published?
The CVE record for CVE-2026-73665 was published on August 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-73665 actively exploited?
CVE-2026-73665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73665?
CVE-2026-73665 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-73665?
The CVE record for CVE-2026-73665 names the fix: "This issue is fixed in version 17.0.9."

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