CVE-2026-46376Public exploitNetwork attack vector

Unauthenticated UCP login via hard-coded credentials

Published May 29, 2026 · Updated May 29, 2026

Hard-coded credentials in FreePBX userman 15.0.42 through 16.0.44 and 17.0.1 through 17.0.6 allow remote attackers to access UCP. The optional generic-template setup creates a UCP template account with a fixed sample password and leaves that password usable until it is changed. Exploitation requires an authenticated administrator to have run the setup and retained the initial password; a successful login grants only the template account's configured UCP permissions.

CVSS severity9.1
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in FreePBX userman 15.0.42 through 16.0.44 and 17.0.1 through 17.0.6 allow remote attackers to access UCP. The optional generic-template setup creates a UCP template account with a fixed sample password and leaves that password usable until it is changed. Exploitation requires an authenticated administrator to have run the setup and retained the initial password; a successful login grants only the template account's configured UCP permissions.

The record

CVE
CVE-2026-46376
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1FreePBXCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

Public exploit references

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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