CVE-2023-33564Public exploitNetwork attack vector

Script execution via unescaped preview theme parameter

Published Aug 1, 2023 · Updated Oct 21, 2024

Reflected XSS in PHPJabbers Time Slots Booking Calendar 3.3 allows remote attackers to execute script via preview.php's theme parameter. The preview endpoint places the decoded theme value into HTML without neutralizing injected quotes, angle brackets, or script markup, so the browser interprets the supplied value as executable content. Exploitation requires a target user to open the crafted preview URL, and successful script runs in the application's browser origin with access to page data and actions available to that user.

CVSS severity6.1
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in PHPJabbers Time Slots Booking Calendar 3.3 allows remote attackers to execute script via preview.php's theme parameter. The preview endpoint places the decoded theme value into HTML without neutralizing injected quotes, angle brackets, or script markup, so the browser interprets the supplied value as executable content. Exploitation requires a target user to open the crafted preview URL, and successful script runs in the application's browser origin with access to page data and actions available to that user.

The record

CVE
CVE-2023-33564
Published
Aug 1, 2023
Updated
Oct 21, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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?

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

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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

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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