CVE-2026-49848
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In versions prior to 1.11.1, the mod_verto module in FreeSWITCH had an issue with user authentication handling that allowed user variables to be written into the connection state before password comparison. These values could persist into subsequent successful logins on the same WebSocket connection.
Risk Assessment
Organizations may be exposed to attacks where incorrect login attempts could lead to unauthorized access if an attacker exploits the same WebSocket connection to log in after previous failed attempts.
Recommendation
It is recommended to upgrade to version 1.11.1 or later to mitigate this vulnerability and to implement additional security measures to monitor and restrict unauthorized login attempts.
Original NVD description (English source)
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's check_auth userauth branch wrote request-supplied userVariables into the connection state before comparing the supplied password. The writes are append-only and the connection is not closed on a failed compare, so values declared on bad-password attempts persisted on the same WebSocket and carried into a subsequent successful login on that connection. This issue has been patched in version 1.11.1.