CVE-2021-24541Network attack vector

Contributor-level stored XSS via shortcode parameters

Published Aug 16, 2021 · Updated Aug 3, 2024

Stored cross-site scripting in Wonder PDF Embed for WordPress before 1.7 allows remote authenticated users to execute script via crafted shortcode parameters. The wonderplugin_pdf shortcode fails to escape its parameter values before rendering them, storing attacker-controlled markup for later viewers. A WordPress user with Contributor-level privileges can plant the payload, which executes in visitors' browsers when the affected content is viewed.

CVSS severity5.4
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Wonder PDF Embed for WordPress before 1.7 allows remote authenticated users to execute script via crafted shortcode parameters. The wonderplugin_pdf shortcode fails to escape its parameter values before rendering them, storing attacker-controlled markup for later viewers. A WordPress user with Contributor-level privileges can plant the payload, which executes in visitors' browsers when the affected content is viewed.

The record

CVE
CVE-2021-24541
Published
Aug 16, 2021
Updated
Aug 3, 2024
Vendor
WonderPlugin
Product
Wonder PDF Embed
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=1.7 <1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WonderPlugin · Wonder PDF Embedversion=1.7 <1.7

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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