CVE-2023-4820 in Podcasting Plugin
Summary
by MITRE • 10/25/2023
The PowerPress Podcasting plugin by Blubrry WordPress plugin before 11.0.12 does not sanitize and escape the media url field in posts, which could allow users with privileges as low as contributor to inject arbitrary web scripts that could target a site admin or superadmin.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 03/05/2025
The vulnerability identified as CVE-2023-4820 affects the PowerPress Podcasting plugin for WordPress, specifically versions prior to 11.0.12. This represents a critical security flaw that undermines the integrity of WordPress content management systems by failing to properly sanitize user input within the media URL field. The issue manifests as a cross-site scripting vulnerability that allows attackers to inject malicious scripts into posts, potentially compromising the security of administrative users who may view these posts. The vulnerability is particularly concerning because it can be exploited by users with minimal privileges, specifically contributors who typically have limited capabilities within the WordPress ecosystem.
The technical flaw stems from insufficient input validation and output escaping mechanisms within the plugin's handling of media URL parameters. When users with contributor privileges create or edit posts containing podcast media URLs, the plugin fails to properly sanitize these inputs before they are rendered in the web interface. This lack of proper sanitization creates an environment where malicious scripts can be embedded within the URL field itself, bypassing standard WordPress security measures designed to protect against such attacks. The vulnerability operates under CWE-79 which categorizes improper neutralization of input during web output, specifically addressing cross-site scripting flaws. This weakness allows for the execution of arbitrary scripts in the context of the victim's browser, potentially enabling session hijacking, data theft, or further compromise of the WordPress installation.
The operational impact of this vulnerability extends beyond simple script injection, as it creates a potential attack vector for more sophisticated exploitation attempts. An attacker with contributor-level access can craft malicious media URLs that, when viewed by administrators or superadmins, execute scripts that could steal cookies, redirect users to malicious sites, or even attempt to escalate privileges within the WordPress environment. The attack surface is particularly broad since contributors often have access to post creation and editing features, making this vulnerability exploitable through routine content management activities. This weakness aligns with ATT&CK technique T1566 which describes social engineering tactics that can be employed through malicious links or scripts embedded in web content, potentially allowing for privilege escalation or data exfiltration.
Mitigation strategies for CVE-2023-4820 should prioritize immediate patching to version 11.0.12 or later, which includes the necessary sanitization and escaping mechanisms to prevent script injection. Administrators should also implement additional security measures such as restricting contributor privileges where possible, implementing content security policies to limit script execution, and monitoring for suspicious post content or user activity. The WordPress security community should also consider implementing more robust input validation at the plugin level, ensuring that all user-provided data undergoes proper sanitization before being processed or displayed. Regular security audits of third-party plugins and maintaining up-to-date software versions remain critical defensive measures against similar vulnerabilities. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern.