Improper Authentication in freeswitch - CVE-2026-49848
Published: June 4, 2026
Vulnerability identifier: #VU133313
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49848
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: www.freeswitch.org
Affected software:
freeswitch
freeswitch
Detailed vulnerability description
The vulnerability allows a remote user to influence call-side variables.
The vulnerability exists due to improper authentication in mod_verto check_auth userauth branch when handling authentication attempts on the same WebSocket connection. A remote user can submit crafted userVariables during failed login attempts and then authenticate successfully on the same connection to influence call-side variables.
Only mod_verto profiles with userauth enabled are vulnerable, and the injected values take effect only after authentication succeeds on the same WebSocket session.
How to mitigate CVE-2026-49848
Install security update from vendor's website.