CVE-2026-100133 in Commerce
Summary
by MITRE • 10/13/2026
Adobe Commerce is affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by an attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim's browser when they browse to the page containing the vulnerable field, potentially gaining elevated access or control over the victim's account or session. Scope is changed.
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Analysis
by VulDB Data Team • 10/13/2026
Adobe Commerce contains a stored Cross-Site Scripting vulnerability within its form handling mechanisms that allows attackers to inject malicious scripts into persistent data fields. Unlike reflected XSS where the payload is delivered via a URL parameter, this flaw resides in how the application processes and subsequently renders user-supplied input without adequate sanitization or encoding. When an attacker submits a crafted script through these vulnerable forms, the content is stored on the server side rather than being discarded after immediate processing. This persistence means that every time a legitimate user accesses a page displaying this data, their browser executes the embedded malicious JavaScript code automatically. The vulnerability stems from insufficient validation of input characters and a failure to properly encode output when rendering dynamic content within HTML contexts, allowing script tags or event handlers like onload or onerror to bypass security filters and execute in the context of the victim's session.
The operational impact of this flaw is significant because it facilitates persistent unauthorized access without requiring complex social engineering tactics beyond initial input submission. Once the malicious payload is stored, any user with appropriate privileges who views the affected page becomes a potential target for credential theft or session hijacking. Attackers can exploit this to steal sensitive information such as authentication cookies, personal data, or administrative credentials by redirecting victims to phishing sites or exfiltrating data through beacon requests. Furthermore, if an administrator is targeted, the attacker may gain elevated access to the commerce platform's backend, potentially leading to complete system compromise, manipulation of product listings, alteration of pricing structures, or integration with malicious payment gateways. This shifts the threat model from a transient risk to a persistent backdoor that remains active until the stored payload is manually removed by an administrator.
From a classification perspective, this vulnerability aligns closely with CWE-79 Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting and specifically falls under Stored XSS variants where data persistence amplifies the attack surface. In terms of adversary behavior mapping to MITRE ATT&CK techniques, this scenario corresponds to T1059 Command and Control via Application Layer Protocol or more directly T1189 Drive-by Compromise if used for initial access through compromised pages, though it is most accurately described under T1204 User Execution when considering the victim's interaction with the malicious content. The change in scope noted indicates that previous assessments may have underestimated the persistence and reach of this flaw, recognizing now that stored payloads create a broader attack vector affecting multiple users rather than just those interacting directly with the injection point at the moment of submission.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. Administrators should immediately identify and remove any injected scripts from database records by auditing recent form submissions for suspicious patterns such as script tags, javascript URIs, or encoded HTML entities that resemble executable code. Patching to the latest version of Adobe Commerce is critical as vendors typically release updates containing input validation fixes and output encoding enhancements specifically designed to address these flaws. On a development level, implementing strict Content Security Policy headers can significantly reduce the impact by preventing unauthorized script execution even if an injection occurs. Additionally adopting parameterized queries for database interactions and ensuring that all user-supplied data is contextually encoded before being rendered in HTML, JavaScript, or CSS contexts will prevent similar vulnerabilities from arising. Regular security audits focusing on input validation layers and automated static code analysis tools can help detect these weaknesses early in the development lifecycle to maintain a robust defense against persistent web-based attacks.