Plugins · lazy-blocks · data as of 2026-11-04
Is Custom Block Builder safe? Known vulnerabilities and latest version
- Latest version
- 4.5.1
- Last updated
- 2026-10-26
- Active installs
- 20,000+
- Known issues on record
- 4
- Unpatched in latest
- 0
- Tested up to WP
- 7.2 · PHP 8.3+
Easily create custom blocks and custom meta fields for Gutenberg without hard coding. — by nK
What to do
- Update to the latest version (4.5.1). Anything older than 4.3.0 has at least one known issue listed below. Dashboard → Updates, or Plugins → “update now”.
- If you cannot update right away, deactivate it until you can.
- Turn on auto-updates for it: Plugins → “Enable auto-updates” on its row.
- If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan.
With WP-CLI: wp plugin get lazy-blocks --field=version shows what you run; wp plugin update lazy-blocks updates it.
Check your version
Known vulnerabilities
4 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version.
low 3.5 CVE-2026-8981 · published 2026-06-09
Cross-site scripting (XSS) in Custom Block Builder (older than 4.3.0)
- Affected
- older than 4.3.0
- Fixed in
- 4.3.0
- Access needed (per CVSS)
- Needs an admin-level account; someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by CISA ADP
Details from the advisory
The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.
high 8.8 CVE-2026-1560 · published 2026-02-11
Remote code execution in Custom Block Builder (4.2.0 and older)
- Affected
- 4.2.0 and older
- Fixed in
- 4.2.1 *
- Access needed (per CVSS)
- Needs a low-level account (e.g. subscriber)
- Range from
- CVE record (the advisory publisher) · score by Wordfence
Details from the advisory
The Custom Block Builder – Lazy Blocks plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.2.0 via multiple functions in the 'LazyBlocks_Blocks' class. This makes it possible for authenticated attackers, with Contributor-level access and above, to execute code on the server.
NVD CVE-2026-1560Wordfence advisoryCode change (fix)Plugin source
medium 4.3 CVE-2025-58258 · published 2025-09-22
Missing authorization check in Custom Block Builder (4.1.0 and older)
- Affected
- 4.1.0 and older
- Fixed in
- 4.1.1
- Access needed (per CVSS)
- Needs a low-level account (e.g. subscriber)
- Range from
- CVE record (the advisory publisher) · score by Patchstack
Details from the advisory
Missing Authorization vulnerability in nK Lazy Blocks lazy-blocks allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Lazy Blocks: from n/a through <= 4.1.0.
high 7.1 CVE-2024-12878 · published 2025-02-26
Reflected cross-site scripting (XSS) in Custom Block Builder (older than 3.8.3)
- Affected
- older than 3.8.3
- Fixed in
- 3.8.3
- Access needed (per CVSS)
- No login needed; someone on the site has to click a link or open a page
- Range from
- CVE record (the advisory publisher) · score by CISA ADP
Details from the advisory
The Custom Block Builder WordPress plugin before 3.8.3 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Recent activity
- 2026-10-26 — latest release on wordpress.org (4.5.1).
- 2026-06-09 — Cross-site scripting (XSS) disclosed (CVE-2026-8981), fixed in 4.3.0.
- 2026-02-11 — Remote code execution disclosed (CVE-2026-1560), fixed in 4.2.1.
- 2025-09-22 — Missing authorization check disclosed (CVE-2025-58258), fixed in 4.1.1.
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Browse vulnerabilities
- Published this week
- Unpatched in the latest version
- By type of vulnerability
- Plugins by nK (3 tracked)
Types found in this plugin: Cross-site scripting (XSS) (2) · Remote code execution (1) · Missing authorization (1)
Where this data comes from
- Version, last update, installs: wordpress.org/plugins/lazy-blocks (Plugins API), fetched 2026-11-04.
- Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
- Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.
Badge for your site or docs (states facts with a date, not a verdict):
<a href="https://laskyr.com/plugins/lazy-blocks"><img src="https://laskyr.com/plugins/lazy-blocks/badge.svg" alt="Custom Block Builder vulnerability status"></a>