CVE-2025-55730 is a critical remote code execution vulnerability affecting the xwiki-pro-macros component of the XWiki platform, specifically the Remote Macros used for migrating content from Confluence. The vulnerability exists in versions 1.0 up to but not including 1.26.5. The root cause is improper encoding or escaping of output (CWE-116) in the handling of the 'title' parameter within the confluence paste code macro. This parameter is not properly escaped, allowing an attacker who has edit permissions on any page to inject malicious XWiki syntax via the 'classes' parameter. This syntax injection leads to remote code execution on the server hosting the XWiki instance. The vulnerability requires no authentication (PR:N) and no user interaction (UI:N), making it trivially exploitable remotely over the network (AV:N). The CVSS v3.1 base score is 10.0, indicating maximum severity with complete compromise of confidentiality, integrity, and availability (C:H/I:H/A:H). The vulnerability was fixed in version 1.26.5 by properly escaping the 'title' parameter to prevent syntax injection. No known exploits are currently reported in the wild, but the ease of exploitation and critical impact make this a high-risk vulnerability for any organization running vulnerable versions of xwiki-pro-macros. Since XWiki is often used for collaborative documentation and knowledge management, exploitation could lead to full system compromise, data theft, or destruction.

European organizations using XWiki with the vulnerable xwiki-pro-macros versions face severe risks. Given the criticality of the vulnerability, attackers could gain full remote code execution capabilities without authentication, allowing them to execute arbitrary commands on the server. This could lead to unauthorized access to sensitive corporate data, intellectual property theft, disruption of business operations, and potential lateral movement within the network. Organizations in sectors such as finance, government, healthcare, and critical infrastructure, which often rely on collaborative platforms like XWiki, are particularly at risk. The ability to compromise confidentiality, integrity, and availability simultaneously could result in regulatory non-compliance (e.g., GDPR violations), financial losses, reputational damage, and operational downtime. Furthermore, since the vulnerability affects content migration macros, organizations actively migrating or integrating Confluence content are at heightened risk. The lack of known exploits in the wild does not diminish the urgency, as the vulnerability's characteristics make it an attractive target for threat actors.

1. Immediate upgrade to xwiki-pro-macros version 1.26.5 or later, where the vulnerability is patched. 2. If upgrading is not immediately feasible, implement strict access controls to restrict page editing permissions only to trusted users to reduce the attack surface. 3. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious XWiki syntax injection patterns targeting the 'classes' parameter. 4. Conduct thorough code reviews and input validation audits for any custom macros or extensions that handle user input to ensure proper escaping and encoding. 5. Monitor logs for unusual editing activity or syntax injection attempts, and establish alerting mechanisms for anomalous behavior. 6. Isolate XWiki instances in segmented network zones to limit potential lateral movement in case of compromise. 7. Educate administrators and users about the risks of editing pages with untrusted content and enforce security best practices for collaborative platforms. 8. Regularly back up XWiki data and configurations to enable rapid recovery in case of exploitation.