CVE-2023-23735 – This vulnerability allows attackers to inject m... (How to Fix)

Q: What is the severity of CVE-2023-23735?

CVE-2023-23735 has a CVSS score of 5.3 (MEDIUM). This vulnerability allows attackers to inject malicious HTML/JavaScript code into Spectra WordPress plugin pages through unauthenticated email input. It affects all WordPress sites using Spectra (formerly Ultimate Addons for Gutenberg) versions up to 2.3.0. Attackers can execute arbitrary scripts in victims' browsers when they view compromised pages.

📋 TL;DR

This vulnerability allows attackers to inject malicious HTML/JavaScript code into Spectra WordPress plugin pages through unauthenticated email input. It affects all WordPress sites using Spectra (formerly Ultimate Addons for Gutenberg) versions up to 2.3.0. Attackers can execute arbitrary scripts in victims' browsers when they view compromised pages.

💻 Affected Systems

Products:

WordPress Spectra (Ultimate Addons for Gutenberg)

Versions: n/a through 2.3.0

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Affects all WordPress installations with vulnerable Spectra versions enabled.

📦 What is this software?

Spectra by Brainstormforce

View all CVEs affecting Spectra →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could steal session cookies, redirect users to malicious sites, perform actions on behalf of authenticated users, or deface websites.

🟠

Likely Case

Attackers inject malicious scripts that steal user session data or redirect to phishing pages when users view affected content.

🟢

If Mitigated

With proper input validation and output encoding, malicious scripts would be neutralized before execution.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires no authentication and uses basic XSS techniques.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.1

Vendor Advisory: https://patchstack.com/database/vulnerability/ultimate-addons-for-gutenberg/wordpress-spectra-wordpress-gutenberg-blocks-plugin-2-3-0-unauthenticated-email-html-injection-vulnerability?_s_id=cve

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Spectra' and click 'Update Now'. 4. Verify version is 2.3.1 or higher.

🔧 Temporary Workarounds

Disable Spectra Plugin

all

Temporarily disable the vulnerable plugin until patched.

wp plugin deactivate ultimate-addons-for-gutenberg

Implement WAF Rules

all

Configure web application firewall to block XSS payloads in email parameters.

🧯 If You Can't Patch

Implement Content Security Policy (CSP) headers to restrict script execution
Disable user registration or email input features that use Spectra components

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Plugins > Spectra version. If version is 2.3.0 or lower, you are vulnerable.

Check Version:

wp plugin get ultimate-addons-for-gutenberg --field=version

Verify Fix Applied:

After updating, verify Spectra version shows 2.3.1 or higher in WordPress plugins list.

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests containing script tags in email parameters
Multiple failed XSS attempts in web server logs

Network Indicators:

HTTP requests with suspicious script payloads in email fields
Unexpected JavaScript execution from Spectra components

SIEM Query:

source="web_server" AND ("<script" OR "javascript:") AND ("email" OR "spectra")

📊 Metadata

CVE ID: CVE-2023-23735

CVSS v3 Score: 5.3 (MEDIUM)

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

CWE: CWE-80

Published: June 3, 2024

Last Updated: March 1, 2025

🔗 References

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🔗 Related Vulnerabilities

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