CVE-2023-0033Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped height attribute

Published Jan 30, 2023 · Updated Mar 27, 2025

Stored XSS in Envigeek Web Services PDF Viewer for WordPress before 1.0.0 allows remote authenticated users to execute script in browsers. The pdfviewer shortcode places its height attribute into rendered markup without validation or escaping, so an injected event handler persists with the post. Contributor-level access is sufficient to store the shortcode, and execution requires another user to interact with the rendered PDF viewer.

CVSS severity5.4
Medium
EPSS probability0.47%
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 Envigeek Web Services PDF Viewer for WordPress before 1.0.0 allows remote authenticated users to execute script in browsers. The pdfviewer shortcode places its height attribute into rendered markup without validation or escaping, so an injected event handler persists with the post. Contributor-level access is sufficient to store the shortcode, and execution requires another user to interact with the rendered PDF viewer.

The record

CVE
CVE-2023-0033
Published
Jan 30, 2023
Updated
Mar 27, 2025
Vendor
Envigeek Web Services
Product
PDF Viewer for WordPress
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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=0 <1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Envigeek Web Services · PDF Viewer for WordPressversion=0 <1.0.0

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NVDCVSS: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 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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