CVE-2026-1543Network attack vector

Stored script execution via unescaped shortcode data

Published May 21, 2026 · Updated May 21, 2026

Stored XSS in ThemeFusion Avada Builder 3.15.2 and earlier allows remote authenticated users to inject scripts through shortcodes. Multiple shortcode renderers insufficiently sanitize stored input and fail to escape dynamic user data, including biographical fields, before inserting it into pages. Subscriber-level access is sufficient, and the script runs in the browser of any user who opens a page that renders the poisoned dynamic data.

CVSS severity6.4
Medium
EPSS probability0.34%
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 ThemeFusion Avada Builder 3.15.2 and earlier allows remote authenticated users to inject scripts through shortcodes. Multiple shortcode renderers insufficiently sanitize stored input and fail to escape dynamic user data, including biographical fields, before inserting it into pages. Subscriber-level access is sufficient, and the script runs in the browser of any user who opens a page that renders the poisoned dynamic data.

The record

CVE
CVE-2026-1543
Published
May 21, 2026
Updated
May 21, 2026
Vendor
ThemeFusion
Product
Avada Builder
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record 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 <=3.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ThemeFusion · Avada Builderversion=0 <=3.15.2

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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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')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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