CVE-2021-24208Public exploitNetwork attack vector

Subscriber-level stored XSS via unsanitized editor inputs

Published Apr 5, 2021 · Updated Aug 3, 2024

Stored XSS in Themeum WP Page Builder before 1.2.4 allows remote authenticated users to execute JavaScript in visitors’ browsers. The wppb_page_save AJAX action accepts unfiltered page_builder_data widget HTML and permits wppb_page_css to terminate a style element and inject a script element. Subscriber-level access is sufficient to store a payload, while administrator interaction with an affected page can enable account creation or a backdoor.

CVSS severity5.4
Medium
EPSS probability0.66%
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 Themeum WP Page Builder before 1.2.4 allows remote authenticated users to execute JavaScript in visitors’ browsers. The wppb_page_save AJAX action accepts unfiltered page_builder_data widget HTML and permits wppb_page_css to terminate a style element and inject a script element. Subscriber-level access is sufficient to store a payload, while administrator interaction with an affected page can enable account creation or a backdoor.

The record

CVE
CVE-2021-24208
Published
Apr 5, 2021
Updated
Aug 3, 2024
Vendor
Themeum
Product
WP Page Builder
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 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=1.2.4 <1.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Themeum · WP Page Builderversion=1.2.4 <1.2.4

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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')
T1059.007JavaScript/JScript

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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