CVE-2023-2439Network attack vector

Stored XSS via unescaped shortcode attributes

Published Jan 31, 2024 · Updated Jun 17, 2025

Stored XSS in the userpro shortcode in DeluxeThemes UserPro 5.1.5 allows remote authenticated users to inject arbitrary web scripts. The shortcode accepts user-supplied attributes without sufficient input sanitization or output escaping, so crafted markup is stored in a page and emitted as executable script. Contributor-level access is required to place the payload, and the script runs whenever a visitor opens the injected page, exposing data or actions available in that visitor's browser session.

CVSS severity6.4
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the userpro shortcode in DeluxeThemes UserPro 5.1.5 allows remote authenticated users to inject arbitrary web scripts. The shortcode accepts user-supplied attributes without sufficient input sanitization or output escaping, so crafted markup is stored in a page and emitted as executable script. Contributor-level access is required to place the payload, and the script runs whenever a visitor opens the injected page, exposing data or actions available in that visitor's browser session.

The record

CVE
CVE-2023-2439
Published
Jan 31, 2024
Updated
Jun 17, 2025
Vendor
DeluxeThemes
Product
UserPro
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record 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=5.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

DeluxeThemes · UserProversion=5.1.5

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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 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')
T1059.007JavaScript/JScript

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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