CVE-2021-24257Public exploitNetwork attack vector

Contributor-level stored XSS via unenforced widget tags

Published May 5, 2021 · Updated Aug 3, 2024

Stored XSS in Leap13 Premium Addons for Elementor before 4.2.8 allows remote authenticated users to run JavaScript in viewers' browsers. The Testimonials and Premium Blog widgets accept attacker-controlled HTML tag values in save_builder requests, and server-side processing fails to enforce the configured tag allowlist before emitting them. Contributor access is required, and the stored script runs when another user views, edits, or previews the page, allowing actions in that user's browser session.

CVSS severity5.4
Medium
EPSS probability0.59%
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 Leap13 Premium Addons for Elementor before 4.2.8 allows remote authenticated users to run JavaScript in viewers' browsers. The Testimonials and Premium Blog widgets accept attacker-controlled HTML tag values in save_builder requests, and server-side processing fails to enforce the configured tag allowlist before emitting them. Contributor access is required, and the stored script runs when another user views, edits, or previews the page, allowing actions in that user's browser session.

The record

CVE
CVE-2021-24257
Published
May 5, 2021
Updated
Aug 3, 2024
Vendor
Leap13
Product
Premium Addons for Elementor
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 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=4.2.8 <4.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Leap13 · Premium Addons for Elementorversion=4.2.8 <4.2.8

Published CVSS scores

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