Custom Block Builder – Lazy Blocks: known security problems
4 known security problems reported for this WordPress plugin, with the affected versions, the fix and what to do.
Updated
In short
There are 4 known security problems on this page. Each one has a fixed version. Updating to version 4.3.0 or newer covers every fixed problem listed here.
Based on public reports. Check the plugin’s changelog. Watchfox AI may be wrong.
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Someone who already has an admin account could plant harmful code that runs for your visitors or admins
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Before 4.3.0
- Fixed in
- 4.3.0
- What to do
- If your site has an affected version, update Custom Block Builder – Lazy Blocks to version 4.3.0 or newer.
- Official ID
- CVE-2026-8981
- Report title
- Custom Block Builder – Lazy Blocks < 4.3.0 - Authenticated (Administrator+) Stored Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Someone with a contributor account on your site could run their own code on your site and take it over
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.2.0
- Fixed in
- 4.2.1
- What to do
- If your site has an affected version, update Custom Block Builder – Lazy Blocks to version 4.2.1 or newer.
- Official ID
- CVE-2026-1560
- Report title
- Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution
- First reported
- Sources
- Wordfence, seen
Someone could do things on your site they should not be allowed to
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 4.1.0
- Fixed in
- 4.1.1
- What to do
- If your site has an affected version, update Custom Block Builder – Lazy Blocks to version 4.1.1 or newer.
- Official ID
- CVE-2025-58258
- Report title
- Lazy Blocks <= 4.1.0 - Missing Authorization
- First reported
- Sources
- Wordfence, seen
Someone could plant harmful code that runs for your visitors or admins
A trusted security source confirmed it. If your site has an affected version, fix it this week.
- Affected versions
- Up to and including 3.8.2
- Fixed in
- 3.8.3
- What to do
- If your site has an affected version, update Custom Block Builder – Lazy Blocks to version 3.8.3 or newer.
- Official ID
- CVE-2024-12878
- Report title
- Custom Block Builder – Lazy Blocks <= 3.8.2 - Reflected Cross-Site Scripting
- First reported
- Sources
- Wordfence, seen
Where this comes from
We collect these reports from public security sources and rewrite them in plain words. Each problem shows its sources and the date we first saw it. This page never says whether your own site is affected: only a check of your site’s versions can tell.
Get an email when your site is affected.
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