CVE-2022-46803 – This vulnerability allows unauthenticated attac... (How to Fix)

Q: What is the severity of CVE-2022-46803?

CVE-2022-46803 has a CVSS score of 9.8 (CRITICAL). This vulnerability allows unauthenticated attackers to inject malicious formulas into CSV files exported by the Noptin WordPress plugin. When victims open these CSV files in spreadsheet applications like Excel, the formulas can execute arbitrary commands, potentially leading to remote code execution. All WordPress sites using vulnerable versions of the Simple Newsletter Plugin - Noptin are affected.

📋 TL;DR

This vulnerability allows unauthenticated attackers to inject malicious formulas into CSV files exported by the Noptin WordPress plugin. When victims open these CSV files in spreadsheet applications like Excel, the formulas can execute arbitrary commands, potentially leading to remote code execution. All WordPress sites using vulnerable versions of the Simple Newsletter Plugin - Noptin are affected.

💻 Affected Systems

Products:

Simple Newsletter Plugin - Noptin (WordPress plugin)

Versions: All versions up to and including 1.9.5

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires the CSV export feature to be accessible, which is typically available to administrators but may be exposed to other roles depending on configuration.

📦 What is this software?

Noptin by Noptin

View all CVEs affecting Noptin →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution on victim machines when they open malicious CSV files, potentially leading to full system compromise, data theft, or ransomware deployment.

🟠

Likely Case

Attackers trick users into opening malicious CSV files that execute commands on their local machines, potentially stealing credentials or installing malware.

🟢

If Mitigated

If users open CSV files in text editors instead of spreadsheet applications, or if security software blocks formula execution, impact is limited to data manipulation.

🌐 Internet-Facing: HIGH - The vulnerability is exploitable without authentication and affects publicly accessible WordPress sites.

🏢 Internal Only: MEDIUM - Internal users could still be tricked into opening malicious CSV files, but attack surface is more limited.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

CSV injection attacks are well-known and easy to weaponize. The vulnerability requires user interaction (opening the CSV file) but no authentication to the WordPress site.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.9.6 or later

Vendor Advisory: https://patchstack.com/database/vulnerability/newsletter-optin-box/wordpress-simple-newsletter-plugin-noptin-plugin-1-9-5-unauth-csv-injection-vulnerability

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Go to Plugins → Installed Plugins. 3. Find 'Simple Newsletter Plugin - Noptin'. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 1.9.6+ from WordPress.org and replace the plugin files.

🔧 Temporary Workarounds

Disable CSV Export

all

Remove or restrict access to CSV export functionality in the plugin settings.

WAF Rule for CSV Injection

all

Implement web application firewall rules to detect and block CSV formula injection attempts.

🧯 If You Can't Patch

Disable the Noptin plugin entirely until patching is possible
Implement strict access controls to limit who can export CSV files

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Installed Plugins. If Noptin version is 1.9.5 or lower, the site is vulnerable.

Check Version:

wp plugin list --name=noptin --field=version (if WP-CLI installed) or check WordPress admin panel

Verify Fix Applied:

After updating, verify the plugin version shows 1.9.6 or higher in WordPress admin.

📡 Detection & Monitoring

Log Indicators:

Unusual CSV export requests, especially with formula characters like =, +, -, @ in parameters

Network Indicators:

HTTP requests to CSV export endpoints with malicious payloads

SIEM Query:

source="wordpress" AND (uri_path="*csv*" OR uri_path="*export*") AND (query="*=*" OR query="*+*" OR query="*-*" OR query="*@*")

📊 Metadata

CVE ID: CVE-2022-46803

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-1236

Published: November 7, 2023

Last Updated: November 21, 2024

🔗 References

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