CVE-2024-11870 – This vulnerability allows authenticated WordPre... (How to Fix)

Q: What is the severity of CVE-2024-11870?

CVE-2024-11870 has a CVSS score of 6.4 (MEDIUM). This vulnerability allows authenticated WordPress users with contributor-level access or higher to inject malicious scripts into website pages using the Event Registration Calendar plugin's shortcodes. When other users visit pages containing these injected scripts, the scripts execute in their browsers, potentially stealing session cookies or performing unauthorized actions. All WordPress sites using vulnerable versions of this plugin are affected.

📋 TL;DR

This vulnerability allows authenticated WordPress users with contributor-level access or higher to inject malicious scripts into website pages using the Event Registration Calendar plugin's shortcodes. When other users visit pages containing these injected scripts, the scripts execute in their browsers, potentially stealing session cookies or performing unauthorized actions. All WordPress sites using vulnerable versions of this plugin are affected.

💻 Affected Systems

Products:

Event Registration Calendar By vcita WordPress Plugin

Versions: All versions up to and including 1.4.0

Operating Systems: All operating systems running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with the vulnerable plugin enabled. Contributor-level access or higher is needed to exploit.

⚠️ 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

Attackers could steal administrator session cookies, take over the WordPress site, deface pages, redirect visitors to malicious sites, or install backdoors for persistent access.

🟠

Likely Case

Malicious contributors or compromised accounts inject tracking scripts, adware, or cryptocurrency miners that execute when visitors access affected pages.

🟢

If Mitigated

With proper user access controls and content security policies, impact is limited to defacement of specific pages containing the injected scripts.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access but is technically simple once an attacker has contributor credentials.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.4.1 or later

Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3159998/event-registration-calendar-by-vcita/trunk

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Event Registration Calendar By vcita'. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 1.4.1+ from WordPress.org and replace plugin files.

🔧 Temporary Workarounds

Remove Contributor XSS Capability

all

Temporarily remove contributor ability to publish posts/pages until patch is applied

wp role remove_cap contributor publish_posts
wp role remove_cap contributor publish_pages

Disable Plugin

all

Deactivate the vulnerable plugin if functionality can be temporarily sacrificed

wp plugin deactivate event-registration-calendar-by-vcita

🧯 If You Can't Patch

Implement strict user access controls and audit contributor accounts
Add Content Security Policy headers to limit script execution sources

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Event Registration Calendar By vcita → Version. If version is 1.4.0 or lower, you are vulnerable.

Check Version:

wp plugin get event-registration-calendar-by-vcita --field=version

Verify Fix Applied:

After updating, verify plugin version shows 1.4.1 or higher in WordPress admin panel.

📡 Detection & Monitoring

Log Indicators:

Unusual shortcode modifications in post/page revisions
Multiple failed contributor login attempts followed by successful login

Network Indicators:

Unexpected external script loads from WordPress pages
Suspicious outbound connections from visitor browsers

SIEM Query:

source="wordpress" AND (event="plugin_update" AND plugin="event-registration-calendar-by-vcita" AND version<="1.4.0") OR (event="post_edit" AND user_role="contributor" AND content CONTAINS "[vcita_" AND content CONTAINS "script")

📊 Metadata

CVE ID: CVE-2024-11870

CVSS v3 Score: 6.4 (MEDIUM)

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

CWE: CWE-79

EPSS Score: 0.13% exploit probability (33.1th percentile)

Published: January 15, 2025

Last Updated: January 15, 2025

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