CVE-2025-63883 identifies a DOM-based cross-site scripting vulnerability in the electic-shop v1.0 e-commerce platform developed by Bhabishya-123. The vulnerability stems from the client-side JavaScript code that reads attacker-controlled inputs, such as URL parameters or fragments, and inserts them directly into the Document Object Model (DOM) using unsafe methods like innerHTML, insertAdjacentHTML, or document.write. These methods do not inherently sanitize or encode the input, allowing malicious scripts embedded in the input to execute in the context of the vulnerable site. This type of XSS is particularly dangerous because it executes entirely on the client side, bypassing server-side protections. An attacker can craft a specially crafted URL containing malicious JavaScript payloads that, when visited by a user, execute arbitrary code within the victim’s browser under the electic-shop origin. This can lead to theft of sensitive information such as cookies, session tokens, or other data accessible to the script, as well as manipulation of the page content or redirection to malicious sites. The vulnerability does not require the attacker to have any privileges on the site (no authentication needed), but it does require the victim to interact with the malicious URL (user interaction). The CVSS 3.1 base score is 5.4, indicating a medium severity level, with the vector indicating network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, and low impact on confidentiality and integrity, with no impact on availability. No patches or fixes are currently linked, and no known exploits have been reported in the wild. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

For European organizations using electic-shop v1.0, this vulnerability poses a moderate risk primarily to confidentiality and integrity of user data. Attackers exploiting this vulnerability can steal session cookies or other sensitive information accessible via JavaScript, potentially leading to account hijacking or fraud. The integrity of the web page can be compromised by injecting malicious scripts that alter content or behavior, potentially damaging brand reputation and user trust. Since the vulnerability requires user interaction, phishing or social engineering campaigns may be used to lure victims to malicious URLs. Although availability is not impacted, the indirect effects of compromised user accounts or data leakage can be significant. E-commerce platforms are critical infrastructure for many European businesses, and exploitation could lead to financial losses, regulatory penalties under GDPR for data breaches, and erosion of customer confidence. The lack of available patches increases the urgency for organizations to implement mitigations. The threat is more pronounced for organizations with high web traffic and those that rely heavily on client-side scripting for dynamic content rendering.

European organizations should immediately audit their electic-shop v1.0 deployments for unsafe DOM insertion patterns, specifically usage of innerHTML, insertAdjacentHTML, and document.write with untrusted inputs. Implement strict input validation and sanitization on all client-side inputs derived from URLs or fragments. Employ context-aware encoding libraries such as DOMPurify or similar to sanitize HTML content before insertion. Consider refactoring client-side code to use safer DOM manipulation methods like textContent or createElement combined with setAttribute to avoid direct HTML injection. Educate developers on secure coding practices to prevent DOM-based XSS. Deploy Content Security Policy (CSP) headers with strict script-src directives to reduce the impact of injected scripts. Monitor web traffic for suspicious URL patterns and user reports of unexpected behavior. Since no official patches are available, organizations should consider isolating vulnerable components or temporarily disabling features that rely on unsafe DOM insertion until fixes are released. Conduct regular security testing, including automated scanning and manual penetration testing focused on client-side vulnerabilities. Finally, raise user awareness about phishing risks associated with clicking unknown links.