CVE-2023-3969Public exploitNetwork attack vector

Stored XSS via unescaped promo_code

Published Jul 27, 2023 · Updated Aug 2, 2024

Cross-site scripting in GZ Scripts Availability Booking Calendar PHP 1.0 allows remote authenticated users to execute script via promo_code. The index.php booking edit handler stores the promo_code value and reflects it into an HTML input value without escaping, allowing script markup to execute when the booking page is viewed. Exploitation requires authenticated booking-management access and a victim browser loading the affected booking record; impact is limited to script execution in that browser session.

CVSS severity5.4
Medium
EPSS probability0.56%
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 Availability Booking Calendar PHP 1.0 allows remote authenticated users to execute script via promo_code. The index.php booking edit handler stores the promo_code value and reflects it into an HTML input value without escaping, allowing script markup to execute when the booking page is viewed. Exploitation requires authenticated booking-management access and a victim browser loading the affected booking record; impact is limited to script execution in that browser session.

The record

CVE
CVE-2023-3969
Published
Jul 27, 2023
Updated
Aug 2, 2024
Vendor
GZ Scripts
Product
Availability Booking Calendar PHP
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GZ Scripts · Availability Booking Calendar PHPversion=1.0

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDB CNACVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Cross-Site Scripting

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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