CVE-2024-23387Network attack vector

Script execution via stored cross-site scripting

Published Jan 19, 2024 · Updated May 30, 2025

Stored cross-site scripting in FusionPBX before 5.1.0 allows remote authenticated users with administrative access to execute script in a user's browser. The public advisory does not identify the affected page, field, or server-side operation that stores unneutralized input. Administrative access is required to plant the payload, and execution occurs only when another logged-in user views the affected content.

CVSS severity4.8
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in FusionPBX before 5.1.0 allows remote authenticated users with administrative access to execute script in a user's browser. The public advisory does not identify the affected page, field, or server-side operation that stores unneutralized input. Administrative access is required to plant the payload, and execution occurs only when another logged-in user views the affected content.

The record

CVE
CVE-2024-23387
Published
Jan 19, 2024
Updated
May 30, 2025
Vendor
FusionPBX
Product
FusionPBX
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=prior to 5.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

FusionPBX · FusionPBXversion=prior to 5.1.0

Published CVSS scores

3.5JPCERT/CCAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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