CVE-2025-49552 is a DOM-based Cross-Site Scripting vulnerability identified in Adobe Connect versions 12.9 and earlier. This vulnerability stems from improper handling of untrusted data within the Document Object Model (DOM) in the client-side code, allowing an attacker with high privileges to inject and execute arbitrary JavaScript in the context of the victim's browser. The attack vector requires the victim to navigate to a maliciously crafted web page, which triggers the execution of the injected script. The vulnerability impacts confidentiality and integrity by enabling session hijacking or other malicious actions performed under the victim's authenticated session. The CVSS v3.1 score of 7.3 reflects a high severity, with network attack vector, high attack complexity, requiring high privileges and user interaction, and a changed scope indicating that the vulnerability affects components beyond the original security boundary. Although no public exploits are reported yet, the potential for session takeover makes this a critical concern for organizations relying on Adobe Connect for remote collaboration and communication. The lack of an official patch link suggests that remediation may require vendor updates or workarounds until a fix is released.

For European organizations, the impact of this vulnerability is significant due to the widespread use of Adobe Connect in sectors such as education, government, finance, and enterprise collaboration. Successful exploitation could lead to unauthorized access to sensitive meetings, confidential communications, and proprietary data, undermining confidentiality and integrity. Session hijacking could facilitate further lateral movement or data exfiltration within affected networks. Given the collaborative nature of Adobe Connect, compromised sessions could also be used to distribute malware or conduct social engineering attacks. The requirement for user interaction and high privileges somewhat limits the attack surface but does not eliminate risk, especially in environments where users have elevated permissions or where phishing campaigns could be used to lure victims. The changed scope means that the impact could extend beyond the immediate application, potentially affecting integrated systems or services. This vulnerability could also undermine trust in remote collaboration tools, which are critical in the European context for compliance with data protection regulations like GDPR.

European organizations should implement the following specific mitigations: 1) Monitor Adobe's security advisories closely and apply patches or updates as soon as they become available to address this vulnerability. 2) Until a patch is released, restrict access to Adobe Connect instances to trusted networks and users with the least privilege necessary to reduce exposure. 3) Implement Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers accessing Adobe Connect. 4) Educate users about the risks of clicking on unknown or suspicious links, especially those purporting to be related to Adobe Connect meetings or resources. 5) Employ web application firewalls (WAFs) with rules designed to detect and block DOM-based XSS attack patterns targeting Adobe Connect. 6) Conduct regular security assessments and penetration tests focusing on client-side vulnerabilities in collaboration platforms. 7) Review and harden session management controls to detect and prevent session hijacking attempts. 8) Consider isolating Adobe Connect access through virtual desktop infrastructure (VDI) or sandboxed environments to contain potential exploitation impacts.