CVE-2026-1560 – This vulnerability in the Lazy Blocks WordPress... (How to Fix)

Q: What is the severity of CVE-2026-1560?

CVE-2026-1560 has a CVSS score of 8.8 (HIGH). This vulnerability in the Lazy Blocks WordPress plugin allows authenticated attackers with Contributor-level access or higher to execute arbitrary code on the server. It affects all versions up to and including 4.2.0. Any WordPress site using the vulnerable plugin is at risk.

📋 TL;DR

This vulnerability in the Lazy Blocks WordPress plugin allows authenticated attackers with Contributor-level access or higher to execute arbitrary code on the server. It affects all versions up to and including 4.2.0. Any WordPress site using the vulnerable plugin is at risk.

💻 Affected Systems

Products:

Custom Block Builder – Lazy Blocks WordPress plugin

Versions: All versions up to and including 4.2.0

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Requires Contributor-level WordPress user access or higher.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:

Review the CVE details at NVD
Check vendor security advisories for your specific version
Test if the vulnerability is exploitable in your environment
Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete server compromise leading to data theft, malware deployment, or site defacement.

🟠

Likely Case

Unauthorized code execution leading to backdoor installation, data exfiltration, or privilege escalation.

🟢

If Mitigated

Limited impact if proper access controls and monitoring are in place.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access but is straightforward once access is obtained.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 4.2.1

Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3454012/

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Lazy Blocks plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.2.1+ from WordPress repository and manually update.

🔧 Temporary Workarounds

Disable plugin

all

Temporarily disable the Lazy Blocks plugin until patched.

wp plugin deactivate lazy-blocks

Restrict user roles

all

Limit Contributor and higher roles to trusted users only.

🧯 If You Can't Patch

Disable the Lazy Blocks plugin immediately.
Implement strict access controls and monitor for suspicious activity from Contributor+ users.

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Plugins > Lazy Blocks version. If version is 4.2.0 or lower, it's vulnerable.

Check Version:

wp plugin get lazy-blocks --field=version

Verify Fix Applied:

Confirm Lazy Blocks plugin version is 4.2.1 or higher.

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to /wp-json/lazyblocks/* endpoints
Suspicious code execution patterns in PHP logs

Network Indicators:

Unexpected outbound connections from WordPress server

SIEM Query:

source="wordpress" AND (uri_path="/wp-json/lazyblocks/*" OR plugin="lazy-blocks")

📊 Metadata

CVE ID: CVE-2026-1560

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-94

EPSS Score: 0.24% exploit probability (47.1th percentile)

Published: February 11, 2026

Last Updated: February 11, 2026

🔗 References

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