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CVE-2026-49848

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

Published: Jun 9, 2026Updated: Jun 10, 2026 Sources: CVE List NVDCWE-287
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 93.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-287

Affected Products

freeswitchsignalwire
Mixed
Communications / voip-telephony
freeswitchfreeswitch
On-prem
Communications / voip-telephony
signalwirecommercialCommunicationsaka freeswitch (related), sofia-sip (related)
freeswitchoss-projectCommunications

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Jun 9, 2026
Last Updated
Jun 10, 2026

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