CVE-2025-2793 is a medium-severity cross-site scripting (XSS) vulnerability identified in IBM Sterling B2B Integrator and IBM Sterling File Gateway products, specifically affecting versions 6.0.0.0 through 6.1.2.6 and 6.2.0.0 through 6.2.0.4. The vulnerability arises from improper neutralization of input during web page generation (CWE-79), allowing an authenticated user to inject arbitrary JavaScript code into the web user interface. This injected code executes within the context of the trusted session, potentially enabling the attacker to alter intended functionality, steal credentials, or perform other malicious actions on behalf of the authenticated user. The vulnerability requires the attacker to have valid credentials (low privilege requirement) and some user interaction to trigger the malicious script. The CVSS v3.1 base score is 5.4, reflecting a medium severity with network attack vector, low attack complexity, privileges required, and user interaction needed. The scope is changed, indicating that the vulnerability affects resources beyond the initially vulnerable component. No known exploits are currently reported in the wild, and no official patches have been linked yet. This vulnerability is significant because IBM Sterling B2B Integrator is widely used in enterprise environments for secure business-to-business data exchange, making any compromise potentially impactful on business operations and data confidentiality.

For European organizations, this vulnerability poses a risk primarily to the confidentiality and integrity of sensitive business data exchanged via IBM Sterling B2B Integrator and Sterling File Gateway. Successful exploitation could lead to credential theft within trusted sessions, enabling attackers to escalate privileges or move laterally within the network. This could disrupt automated business processes, cause data leakage, or facilitate further attacks such as fraud or intellectual property theft. Given the critical role of these products in supply chain and partner communications, exploitation could also damage business relationships and compliance posture, especially under GDPR and other data protection regulations. The requirement for authenticated access somewhat limits the attack surface but does not eliminate risk, as insider threats or compromised credentials could be leveraged. The lack of known exploits reduces immediate risk but does not preclude targeted attacks against high-value European enterprises using these IBM products.

European organizations should implement the following specific mitigations: 1) Immediately audit and restrict user access to IBM Sterling B2B Integrator and File Gateway to the minimum necessary, enforcing strong authentication and session management controls. 2) Monitor and log user activities within the web UI to detect anomalous behavior that may indicate exploitation attempts. 3) Apply input validation and output encoding controls at the application layer where possible, including custom web application firewalls (WAF) rules tailored to detect and block suspicious script injections targeting the Sterling UI. 4) Engage with IBM support to obtain and deploy any forthcoming security patches or updates addressing CVE-2025-2793 as soon as they become available. 5) Conduct security awareness training for users with access to these systems to recognize phishing or social engineering attempts that could lead to credential compromise. 6) Consider network segmentation to isolate Sterling B2B Integrator servers from broader enterprise networks to limit lateral movement in case of compromise. 7) Regularly review and update incident response plans to include scenarios involving web UI-based XSS attacks on critical business integration platforms.