CVE-2026-18021Network attack vector

Unauthenticated shortcode execution via unchecked action value

Published Sep 8, 2026 · Updated Sep 8, 2026

Code injection in Beaver Builder Page Builder 2.10.3.1 and earlier allows remote attackers to execute arbitrary registered shortcodes. The affected path in classes/class-fl-builder.php passes an inadequately validated action value to do_shortcode, which dispatches registered WordPress shortcode handlers. No account or user interaction is required; resulting data access or changes depend on the installed shortcode handlers.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Beaver Builder Page Builder 2.10.3.1 and earlier allows remote attackers to execute arbitrary registered shortcodes. The affected path in classes/class-fl-builder.php passes an inadequately validated action value to do_shortcode, which dispatches registered WordPress shortcode handlers. No account or user interaction is required; resulting data access or changes depend on the installed shortcode handlers.

The record

CVE
CVE-2026-18021
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
FastLine Media LLC
Product
Beaver Builder Page Builder
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 <=2.10.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FastLine Media LLC · Beaver Builder Page Builderversion=0 <=2.10.3.1

Published CVSS scores

6.5WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

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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