CVE-2023-36137Public exploitNetwork attack vector

Script execution via unencoded preview theme

Published Aug 3, 2023 · Updated Oct 17, 2024

Reflected XSS in preview.php in PHPJabbers Class Scheduling System 1.0 allows remote attackers to run script via the theme parameter. preview.php places the decoded theme value into an HTML attribute without context-appropriate encoding, allowing a quote to terminate the attribute and inject a script element. Exploitation requires a user to open a crafted preview URL, after which the script runs in that user's browser context and can read or modify data available to the page.

CVSS severity6.1
Medium
EPSS probability0.36%
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 preview.php in PHPJabbers Class Scheduling System 1.0 allows remote attackers to run script via the theme parameter. preview.php places the decoded theme value into an HTML attribute without context-appropriate encoding, allowing a quote to terminate the attribute and inject a script element. Exploitation requires a user to open a crafted preview URL, after which the script runs in that user's browser context and can read or modify data available to the page.

The record

CVE
CVE-2023-36137
Published
Aug 3, 2023
Updated
Oct 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 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

6.1NIST NVDCVSS: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')
T1059.007Command and Scripting Interpreter: JavaScript

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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