# CVE-2026-73664 — FreePBX backup

> As of 2026-08-14, CVE-2026-73664 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in FreePBX backup, CVSS v4.0 8.6. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73664 as of 2026-08-14; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-14

## What is CVE-2026-73664?

FreePBX is an open source IP PBX. From 17.0.5.34 until 17.0.11, the publicKeySave AJAX endpoint in Backup.class.php accepts an authenticated administrator's SSH public key and appends it to /home/asterisk/.ssh/authorized_keys for the asterisk system user without reliably enforcing backup-only command and source restrictions. The key grants persistent shell access that can execute arbitrary commands, access FreePBX and call data, modify system files, and disrupt services. This issue is fixed in version 17.0.11.

The record classifies CVE-2026-73664 under weakness classes [CWE-269](https://intel.threadlinqs.com/cwe/CWE-269), [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284), [CWE-732](https://intel.threadlinqs.com/cwe/CWE-732). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 53 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 8.6 — High (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-13, last modified 2026-08-14

## Is CVE-2026-73664 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **FreePBX**: backup

## How to fix CVE-2026-73664

No vendor patch reference has been recorded for CVE-2026-73664 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-73664

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73664, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org. Last verified by Threadlinqs on 2026-08-15.

**Vendor advisory and patch**

- [github.com](https://github.com/FreePBX/security-reporting/security/advisories/GHSA-24w6-hpg3-rwfg)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73664
Full detection coverage and IOCs for threats exploiting CVE-2026-73664 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp