CVE-2025-53276 is a Cross-site Scripting (XSS) vulnerability classified under CWE-79, specifically a DOM-based XSS, affecting the Omnipress product developed by omnipressteam. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be injected and executed in the context of a user's browser session. The affected versions include all versions up to and including 1.6.3. The vulnerability has a CVSS 3.1 base score of 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 (AV:N) with low attack complexity (AC:L), but requires some level of privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L, I:L, A:L). DOM-based XSS vulnerabilities allow attackers to manipulate the Document Object Model environment in the victim’s browser, potentially leading to session hijacking, redirection to malicious sites, or unauthorized actions performed on behalf of the user. Although no known exploits are currently reported in the wild, the presence of this vulnerability in a web-facing product used for content or document management could be leveraged by attackers to target users or administrators. The lack of available patches at the time of publication indicates that organizations should prioritize mitigation and monitoring until an official fix is released.

For European organizations using Omnipress, this vulnerability poses a risk primarily to the confidentiality and integrity of user sessions and data. Exploitation could lead to theft of sensitive information, unauthorized actions performed under the guise of legitimate users, and potential disruption of services. Given that Omnipress is likely used in publishing, content management, or document dissemination contexts, compromised systems could result in reputational damage, leakage of intellectual property, or manipulation of published content. The requirement for user interaction means phishing or social engineering could be used to trigger the exploit, increasing risk in environments with less user security awareness. The changed scope indicates that the impact could extend beyond the immediate application, potentially affecting integrated systems or services. European organizations with web portals or intranet services powered by Omnipress should consider this a medium risk but with potential for escalation if combined with other vulnerabilities or poor security practices.

1. Immediate mitigation should include implementing strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of DOM-based XSS. 2. Employ input validation and output encoding on all user-controllable inputs, especially those reflected in the DOM, to neutralize malicious payloads. 3. Restrict privileges of users accessing Omnipress to the minimum necessary to reduce the risk posed by the PR:L requirement. 4. Educate users on the risks of clicking untrusted links or interacting with suspicious content to mitigate the UI:R factor. 5. Monitor web application logs and user activity for unusual behavior indicative of exploitation attempts. 6. Isolate Omnipress instances from critical backend systems to limit scope expansion. 7. Regularly check for vendor updates or patches and apply them promptly once available. 8. Consider deploying web application firewalls (WAF) with rules tuned to detect and block XSS payloads targeting Omnipress. 9. Conduct security testing, including penetration testing focused on DOM-based XSS vectors, to identify and remediate additional weaknesses.