CVE-2022-0271 in LearnPress Plugin
Summary
by MITRE • 04/11/2022
The LearnPress WordPress plugin before 4.1.6 does not sanitise and escape the lp-dismiss-notice before outputting it back via the lp_background_single_email AJAX action, leading to a Reflected Cross-Site Scripting
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Analysis
by VulDB Data Team • 04/13/2022
The LearnPress WordPress plugin vulnerability CVE-2022-0271 represents a critical reflected cross-site scripting flaw that affects versions prior to 4.1.6. This vulnerability exists within the plugin's handling of user input through the lp_background_single_email AJAX endpoint, where the lp-dismiss-notice parameter is not properly sanitised or escaped before being output back to users. The flaw allows malicious actors to inject arbitrary JavaScript code into the browser of unsuspecting users who visit compromised pages, making it a classic example of a reflected XSS vulnerability that can be exploited through crafted URLs or email links.
The technical implementation of this vulnerability stems from improper input validation and output escaping practices within the plugin's backend processing. When the lp_background_single_email AJAX action receives the lp-dismiss-notice parameter, it fails to apply appropriate sanitisation filters or HTML escaping mechanisms before rendering the value in the HTTP response. This creates an attack surface where malicious payloads can be injected and executed in the context of a victim's browser session, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability is classified under CWE-79 as a failure to escape output, which directly maps to the common weakness patterns identified in the CWE database for web application security flaws.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged in various attack scenarios that compromise user security and system integrity. An attacker could craft malicious URLs containing XSS payloads that, when clicked by authenticated users with sufficient privileges, could execute code in their browser context. This could lead to unauthorized administrative actions, data exfiltration, or the installation of additional malware through browser-based attack vectors. The vulnerability is particularly concerning in WordPress environments where LearnPress is used for educational content management, as it could allow attackers to compromise course materials, user data, or administrative functions through subtle social engineering attacks.
Mitigation strategies for CVE-2022-0271 primarily focus on immediate remediation through plugin updates to version 4.1.6 or later, which contain the necessary sanitisation and escaping fixes. Security administrators should also implement additional defensive measures including input validation at multiple layers, output encoding for all dynamic content, and regular security audits of WordPress plugins and themes. Network-based protections such as web application firewalls can provide additional defense-in-depth, though the most effective solution remains the timely application of vendor security patches. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments or links, demonstrating how poorly secured web applications can serve as entry points for broader attack campaigns targeting WordPress environments. Organizations should also consider implementing Content Security Policy headers to limit the execution of unauthorized scripts and reduce the impact of successful XSS exploitation attempts.