CVE-2023-3559Network attack vector

Cross-site scripting via unneutralized request parameters

Published Jul 8, 2023 · Updated Oct 23, 2024

Cross-site scripting in GZ Scripts PHP GZ Appointment Scheduling Script 1.8 allows remote authenticated users to inject script via /load.php. The endpoint places first_name, second_name, phone, address_1, or country request data into a web response without neutralizing script content. A victim must open the resulting content; the script then runs in that victim's browser and can alter displayed application content.

CVSS severity3.5
Low
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in GZ Scripts PHP GZ Appointment Scheduling Script 1.8 allows remote authenticated users to inject script via /load.php. The endpoint places first_name, second_name, phone, address_1, or country request data into a web response without neutralizing script content. A victim must open the resulting content; the script then runs in that victim's browser and can alter displayed application content.

The record

CVE
CVE-2023-3559
Published
Jul 8, 2023
Updated
Oct 23, 2024
Vendor
GZ Scripts
Product
PHP GZ Appointment Scheduling Script
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 2024Record 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=1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GZ Scripts · PHP GZ Appointment Scheduling Scriptversion=1.8

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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.

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

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-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.

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Technologies

Your stack

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Your stack

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