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Medium · 4.3 CVE-2026-49848 EUVD-2026-35495

FreeSWITCH: Pre-authentication `userVariables` injection in `mod_verto`

Published Jun 9, 2026 · Updated Jun 9, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
signalwire freeswitch < 1.11.1 —

References