CVE-2025-49411 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Vikas Sharma iFrame Block plugin, specifically versions up to 0.1.1. The vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and later executed in the context of users' browsers when they access affected pages. This type of vulnerability enables attackers to inject arbitrary JavaScript code that can execute with the privileges of the victim user, potentially leading to session hijacking, defacement, redirection to malicious sites, or theft of sensitive information. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) reveals that the attack can be performed remotely over the network with low attack complexity, requires privileges (PR:L) likely meaning some authenticated access, and user interaction is required (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is low to moderate, but the stored nature of the XSS increases risk as malicious payloads persist and affect multiple users. No patches or known exploits in the wild have been reported yet, but the vulnerability is publicly disclosed and should be addressed promptly to prevent exploitation. The lack of a patch link suggests that remediation may require vendor intervention or manual mitigation.

For European organizations, this vulnerability poses a significant risk especially if the Vikas Sharma iFrame Block plugin is used within their web infrastructure, such as content management systems or websites that embed external content via iframes. Stored XSS can lead to compromise of user sessions, theft of credentials, and unauthorized actions performed on behalf of users, which can result in data breaches or reputational damage. Given the scope change indicated in the CVSS vector, exploitation could affect multiple components or users beyond the initial vulnerable plugin, amplifying the impact. Organizations in sectors with high regulatory requirements such as finance, healthcare, and government are particularly vulnerable to compliance violations if user data confidentiality or integrity is compromised. Additionally, the requirement for some level of privileges and user interaction means insider threats or targeted phishing campaigns could leverage this vulnerability effectively. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers often develop exploits rapidly after disclosure.

1. Immediate mitigation involves auditing all web applications and CMS instances for the presence of the Vikas Sharma iFrame Block plugin and identifying affected versions (up to 0.1.1). 2. If an official patch or update becomes available from the vendor, prioritize applying it promptly. 3. In the absence of a patch, implement input validation and output encoding on all user-supplied data that is rendered within the iframe block to neutralize potentially malicious scripts. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security testing, including automated scanning and manual penetration testing focused on stored XSS vectors. 6. Educate users and administrators about the risks of phishing and social engineering that could trigger user interaction required for exploitation. 7. Monitor web server and application logs for suspicious activity indicative of XSS exploitation attempts. 8. Consider isolating or disabling the vulnerable plugin if it is not critical to operations until a secure version is available.