What is CVE-2020-11022 vulnerability?
CVE-2020-11022 is a reflected cross-site scripting (XSS) vulnerability affecting the jQuery JavaScript library versions 3.5.0 and earlier. This vulnerability arises when unsanitized user input is dynamically injected into a webpage, allowing attackers to execute arbitrary scripts in the context of a victim's browser. Successful exploitation can result in data exfiltration, session hijacking, or redirection to malicious domains.
When was it discovered?
CVE-2020-11022 was disclosed on May 4, 2020, by the jQuery team during their routine review of security in the framework. This discovery followed a coordinated vulnerability disclosure process and was shared publicly to encourage patch adoption.
Affected products & versions
Product | Versions Affected | Fixed Versions / Patch Links |
jQuery JavaScript Library | <= 3.5.0 |
CVE-2020-11022 technical description
This reflected XSS vulnerability stems from improper sanitization of user-supplied input when using jQuery's htmlPrefilter. By crafting malicious HTML content, attackers can trick applications into rendering unsafe scripts. Exploitation vectors often leverage parameterized query strings in URLs to inject malicious payloads. This vulnerability can target webforms, search bars, or URL handlers that utilize vulnerable versions of jQuery.
Tactics, Techniques & Procedures (TTPs)
Attackers exploiting CVE-2020-11022 typically use phishing emails or malicious links to lure users into triggering the vulnerability. Once conditions are met, attackers can execute arbitrary JavaScript on the victim's browser, compromising data or enabling lateral movement within the application.
Indicators of compromise
Key IoCs to monitor include suspicious query parameters in application URLs and anomalous JavaScript execution from untrusted domains. Network logs should be examined for repeated interactions with known phishing domains or IPs.
Known proof-of-concepts & exploits
Proof-of-concept (PoC) scripts for CVE-2020-11022 have circulated among security researchers, detailing exploitation techniques. Several active campaigns have been reported that target unpatched web applications using legacy jQuery libraries.
How to detect CVE-2020-11022 vulnerability?
Detection begins with static code analysis to identify library dependencies, focusing on applications using jQuery ≤3.5.0. Organizations should inspect client-accessible forms and input fields for vulnerable data-parsing patterns. Employ host-based monitoring tools and SIEM queries to flag suspicious activity tied to reflected XSS techniques.
Impact & risk of CVE-2020-11022 vulnerability
CVE-2020-11022 poses significant risks to data confidentiality. Exploitation can result in the theft of sensitive information, compromise of user accounts, and safe browsing violations. Real-world misuse has included instances of session hijacking and redirecting traffic to phishing domains, jeopardizing business operations and trust.
Mitigation & remediation strategies
Organizations should immediately update to jQuery 3.5.1 or later, which resolves the vulnerability. Configuration review of web applications to implement strict input validation and output encoding is also advised. Enable Content Security Policy (CSP) headers to minimize exploitation risks, and perform routine dependency audits to ensure no outdated libraries are in use.
CVE-2020-11022 Vulnerability FAQs
CVE-2020-11022 is a cross-site scripting (XSS) vulnerability in jQuery ≤3.5.0. It works by exploiting inadequate input sanitization, allowing attackers to execute malicious scripts through unsanitized user-supplied content in web applications.
CVE-2020-11022 does not "infect" systems like malware but is exploited through web applications using vulnerable jQuery versions. Attackers inject malicious payloads via forms or URL parameters, tricking the app into executing unauthorized actions.
While patches for CVE-2020-11022 are widely available, it remains a threat for systems still using outdated jQuery versions. Unmaintained or legacy applications may remain vulnerable, making awareness and updates key to mitigation.
To protect against CVE-2020-11022, organizations must update to patch versions and perform regular dependency audits. Implementing input validation, employing CSP headers, and monitoring web traffic for malicious activity are essential security best practices.
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