CVE-2024-4400Public exploitNetwork attack vector

Stored XSS via unsanitized GridBlock HTML

Published May 16, 2024 · Updated Apr 8, 2026

Stored XSS in BoldGrid Post and Page Builder 1.26.4 and earlier allows remote authenticated users to inject scripts through GridBlock content. The Boldgrid_Editor_Ajax GridBlock flow accepted HTML without the sanitize_gridblock_html filtering added by the patch. Contributor-level access is sufficient, and the stored script executes when a visitor opens the injected page.

CVSS severity6.4
Medium
EPSS probability0.26%
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 BoldGrid Post and Page Builder 1.26.4 and earlier allows remote authenticated users to inject scripts through GridBlock content. The Boldgrid_Editor_Ajax GridBlock flow accepted HTML without the sanitize_gridblock_html filtering added by the patch. Contributor-level access is sufficient, and the stored script executes when a visitor opens the injected page.

The record

CVE
CVE-2024-4400
Published
May 16, 2024
Updated
Apr 8, 2026
Vendor
Web Ventures
Product
Post and Page Builder
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 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 <=1.26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Web Ventures · Post and Page Builderversion=0 <=1.26.4

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 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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