CVE-2026-49848Network attack vector

Call-variable injection via pre-authentication connection-state writes

Published Jun 9, 2026 · Updated Jun 9, 2026

Improper authentication in SignalWire FreeSWITCH before 1.11.1 allows remote authenticated users to inject call-side variables. The mod_verto check_auth userauth branch appends request-supplied userVariables to connection state before checking the password, and failed logins leave those values in place. Exploitation requires network access to a userauth-enabled Verto WebSocket listener and valid account credentials; a later successful login on the same socket carries the injected values into call variables.

CVSS severity4.3
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in SignalWire FreeSWITCH before 1.11.1 allows remote authenticated users to inject call-side variables. The mod_verto check_auth userauth branch appends request-supplied userVariables to connection state before checking the password, and failed logins leave those values in place. Exploitation requires network access to a userauth-enabled Verto WebSocket listener and valid account credentials; a later successful login on the same socket carries the injected values into call variables.

The record

CVE
CVE-2026-49848
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
SignalWire
Product
FreeSWITCH
Classifications
CWE-287, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SignalWire · FreeSWITCHversion=< 1.11.1

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1565Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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