Vulnerability · Published Jun 9, 2026 · Assigned by GitHub_M

CVE-2026-49848FreeSWITCH: Pre-authentication `userVariables` injection in `mod_verto`

Medium 4.3

In plain English

A medium-severity improper authentication in freeswitch from signalwire. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 93.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
signalwire	freeswitch	< 1.11.1

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/signalwire/freeswitch/security/advisories/GHSA-j38x-xm7f-9p2f x_refsource_CONFIRM
https://github.com/signalwire/freeswitch/releases/tag/v1.11.1 x_refsource_MISC