CVE-2025-49934 is a stored Cross-site Scripting (XSS) vulnerability found in CrocoBlock JetBlocks for Elementor, a popular WordPress plugin used for enhancing website functionality. The vulnerability arises from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that are stored and subsequently executed in the browsers of other users visiting the affected site. This can lead to unauthorized actions such as session hijacking, theft of sensitive information, or defacement of web content. The affected versions include all releases up to and including 1.3.18. The vulnerability requires the attacker to have low privileges (PR:L) and user interaction (UI:R), such as convincing a user to visit a crafted page or interact with malicious content. The CVSS v3.1 base score is 5.4, indicating medium severity, with attack vector being network (AV:N), low attack complexity (AC:L), partial confidentiality and integrity impact (C:L/I:L), and no availability impact (A:N). No known exploits have been reported in the wild as of the publication date. The vulnerability's scope is changed (S:C), meaning the impact extends beyond the vulnerable component to other components or users. This vulnerability is particularly relevant for websites using JetBlocks for Elementor, which is widely adopted in WordPress environments for building dynamic content blocks. Exploitation could compromise user data and trust, especially on sites handling sensitive user interactions or e-commerce transactions.

For European organizations, this vulnerability poses a risk primarily to confidentiality and integrity of user data on websites using JetBlocks for Elementor. Attackers could exploit the stored XSS to steal session cookies, credentials, or other sensitive information from users, potentially leading to account takeover or unauthorized transactions. The integrity of website content could also be compromised, damaging brand reputation and user trust. Although availability is not directly impacted, the indirect effects of exploitation could lead to service disruptions or increased support costs. Organizations in sectors such as e-commerce, finance, healthcare, and government, which rely heavily on web presence and user trust, are particularly vulnerable. The medium severity score suggests a moderate risk, but the widespread use of WordPress and Elementor in Europe increases the potential attack surface. Additionally, the requirement for user interaction means phishing or social engineering could be used to facilitate exploitation. Failure to remediate could result in regulatory compliance issues under GDPR if personal data is compromised.

1. Apply patches or updates from CrocoBlock as soon as they become available to address this vulnerability. 2. Implement strict input validation and output encoding on all user-supplied data within the JetBlocks plugin and associated web applications to prevent script injection. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4. Conduct regular security audits and code reviews focusing on input handling in custom Elementor blocks or extensions. 5. Educate users and administrators about phishing and social engineering risks to reduce the likelihood of user interaction-based exploitation. 6. Monitor web server and application logs for unusual activity or indicators of compromise related to XSS attacks. 7. Use web application firewalls (WAFs) configured to detect and block XSS payloads targeting JetBlocks components. 8. Limit plugin permissions and isolate critical functionalities to reduce the impact scope if exploitation occurs. 9. Backup website data regularly to enable quick restoration in case of defacement or compromise. 10. Coordinate with incident response teams to prepare for potential exploitation scenarios involving this vulnerability.