CVE-2026-64970 in ATutor
Summary
by MITRE • 08/20/2026
ATutor is vulnerable to Stored Cross Site Scripting in registration functionality. An attacker can register a new account and enter a JavaScript payload in the phone field during registration. When any authenticated user visits the attacker's public profile, the profile template echoes the phone value without output encoding and the browser executes the payload leading to the theft of user's session cookie.
Product is no longer actively supported and the vulnerabilities have not been fixed. Only version 2.2.4 was tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified in ATutor represents a classic Stored Cross-Site Scripting (XSS) flaw located within the user registration module of the web application. This specific instance is categorized under CWE-80, which describes Improper Neutralization of Script-Related HTML Tags in a Web Page, commonly known as XSS. The root cause lies in the failure to implement proper output encoding or sanitization when rendering user-supplied data back into the browser environment. Specifically, during the account creation process, an attacker is able to inject malicious JavaScript code by populating the phone number field with a crafted payload rather than a valid telephone number format. Because the application treats this input as trusted content without validating its nature, the script becomes permanently stored in the backend database associated with the newly created user profile.
The operational impact of this vulnerability is significant due to its persistent and targeted nature. Unlike reflected XSS attacks that require tricking a user into clicking a malicious link, Stored XSS persists on the server side, ensuring that every time an authenticated user views the attacker's public profile page, the embedded script executes automatically within their browser context. This execution occurs in the security context of the vulnerable application, granting the injected code full access to cookies, local storage, and session tokens associated with ATutor. Consequently, an adversary can perform Session Hijacking by stealing active session identifiers from legitimate users who visit the compromised profile. This allows the attacker to impersonate these users without needing their passwords or multi-factor authentication credentials, effectively bypassing standard access controls through credential theft rather than exploitation of authentication logic flaws.
From a threat intelligence perspective, this vulnerability aligns with several techniques in the MITRE ATT&CK framework for enterprise security. The initial injection phase corresponds to T1059, Command and Scripting Interpreter, specifically using JavaScript within an HTML context. The persistence mechanism falls under T1189, Drive-by Client Side Implant, as the malicious code is delivered via a legitimate website visit rather than direct user interaction with a file download. Furthermore, the theft of session cookies maps directly to T1539, Steal Web Session Cookie, which enables unauthorized access to sensitive information and accounts. The lack of input validation on the phone field indicates a broader pattern of insufficient data type enforcement, suggesting that other fields in the registration form may also be susceptible to similar injection attacks if they are rendered without proper encoding.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements. Since ATutor is no longer actively supported and patches have not been released by the vendor, organizations relying on version 2.2.4 or potentially other untested versions face inherent risks that cannot be resolved through official updates. The most effective mitigation involves isolating the application from direct internet access if possible, restricting user registration to pre-approved accounts only, or disabling public profile viewing entirely until a secure alternative can be deployed. If immediate isolation is not feasible, implementing a Web Application Firewall (WAF) with rules specifically designed to detect and block JavaScript injection patterns in form submissions can provide a layer of defense against exploitation attempts. Additionally, deploying Content Security Policy headers that restrict script execution sources can mitigate the impact by preventing the browser from executing inline scripts injected into the DOM.
Long-term resolution requires migrating away from unsupported legacy software to modern platforms with active security maintenance and rigorous input validation practices. Developers should adopt secure coding standards such as OWASP Secure Coding Practices, which mandate strict output encoding for all dynamic content rendered in HTML contexts. Implementing server-side sanitization libraries that whitelist acceptable characters for phone numbers can prevent the storage of malicious payloads at the database level. Furthermore, enabling HttpOnly flags on session cookies ensures that even if XSS is successfully exploited, the stolen cookie cannot be accessed via JavaScript, thereby neutralizing the primary attack vector described in this vulnerability assessment.