CVE-2024-1934 – This vulnerability in the WP Compress

📋 TL;DR

This vulnerability in the WP Compress – Image Optimizer WordPress plugin allows unauthenticated attackers to reset the CDN region and set malicious URLs for image delivery. It affects all versions up to and including 6.11.10 due to a missing capability check. Any WordPress site using this vulnerable plugin is at risk.

💻 Affected Systems

Products:

WP Compress – Image Optimizer WordPress plugin

Versions: All versions up to and including 6.11.10

Operating Systems: All operating systems running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects WordPress installations with the WP Compress plugin active. No special configuration required for exploitation.

📦 What is this software?

Wp Compress by Wpcompress

View all CVEs affecting Wp Compress →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could redirect all images on the site to malicious domains, enabling phishing campaigns, malware distribution, or complete site defacement through image substitution.

🟠

Likely Case

Attackers will set malicious CDN URLs to serve compromised images, potentially delivering malware or conducting phishing attacks against site visitors.

🟢

If Mitigated

With proper web application firewalls and monitoring, attacks can be detected and blocked before causing significant damage.

🌐 Internet-Facing: HIGH

🏢 Internal Only: LOW

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

The vulnerability requires no authentication and has a simple exploitation path, making it attractive for attackers.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Versions after 6.11.10

Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3054445@wp-compress-image-optimizer/trunk&old=3048575@wp-compress-image-optimizer/trunk&sfp_email=&sfph_mail=#file2

Restart Required: No

Instructions:

1. Log into WordPress admin panel
2. Navigate to Plugins → Installed Plugins
3. Find WP Compress – Image Optimizer
4. Click 'Update Now' if available
5. If no update available, deactivate and remove the plugin immediately

🔧 Temporary Workarounds

Deactivate Plugin

all

Temporarily disable the vulnerable plugin until patched version is available

wp plugin deactivate wp-compress-image-optimizer

Web Application Firewall Rule

all

Block requests to the vulnerable endpoint

Add WAF rule to block requests containing 'wps_local_compress' in URL or parameters

🧯 If You Can't Patch

Deactivate the WP Compress plugin immediately and use alternative image optimization solutions
Implement strict WAF rules to block unauthenticated requests to plugin endpoints

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → WP Compress → Version number. If version is 6.11.10 or lower, you are vulnerable.

Check Version:

wp plugin get wp-compress-image-optimizer --field=version

Verify Fix Applied:

After updating, verify plugin version is higher than 6.11.10 in WordPress admin panel.

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to wp-admin/admin-ajax.php with 'action' parameter containing 'wps_local_compress'
Multiple failed authentication attempts followed by successful plugin endpoint access

Network Indicators:

Unusual outbound connections to new CDN domains from WordPress server
HTTP requests modifying CDN configuration without authentication

SIEM Query:

source="wordpress.log" AND ("wps_local_compress" OR "wp-compress") AND status=200 AND user="-"

📊 Metadata

CVE ID: CVE-2024-1934

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-862

Published: April 9, 2024

Last Updated: August 9, 2025

🔗 References

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🔗 Related Vulnerabilities

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