CVE-2025-6923 is a reflected Cross-site Scripting (XSS) vulnerability identified in Talent Software's UNIS product, affecting all versions prior to build 42957. This vulnerability is classified under CWE-79, which involves improper neutralization of input during web page generation. Specifically, the application fails to adequately sanitize or encode user-supplied input before reflecting it back in HTTP responses, enabling attackers to inject malicious JavaScript code. When a victim interacts with a crafted URL or input, the malicious script executes in the victim's browser context, potentially allowing attackers to steal session cookies, perform actions on behalf of the user, or redirect users to malicious sites. The CVSS v3.1 base score is 5.4, indicating a medium severity level. The attack vector is network-based (AV:N), requiring no privileges (PR:N) but does require user interaction (UI:R). The impact affects confidentiality and integrity to a limited extent (C:L, I:L) but does not impact availability (A:N). No patches or exploits are currently publicly available, but the vulnerability is officially published and reserved as of mid-2025. This vulnerability is significant because UNIS is used in various organizational contexts, potentially including HR and talent management systems, which may contain sensitive personal data. The lack of proper input validation and output encoding is a common web application security flaw that can be exploited in phishing campaigns or targeted attacks against users of the affected software.

For European organizations, the impact of CVE-2025-6923 can be multifaceted. Although the vulnerability does not directly compromise system availability, it can lead to unauthorized disclosure of sensitive information such as session tokens or personal data, undermining confidentiality. Integrity may be affected if attackers use the XSS flaw to perform unauthorized actions on behalf of users, potentially altering data within the UNIS system. This is particularly concerning for organizations handling sensitive employee or candidate information. The requirement for user interaction means phishing or social engineering attacks could be used to exploit this vulnerability. Given the medium severity, the risk is moderate but should not be underestimated, especially in sectors with stringent data protection regulations like GDPR. Exploitation could lead to reputational damage, regulatory penalties, and loss of trust. Additionally, attackers might leverage this vulnerability as a foothold for further attacks within the network. Organizations relying heavily on Talent Software UNIS for HR or talent management processes may face operational disruptions if attackers manipulate or exfiltrate data.

Immediate mitigation should focus on implementing robust input validation and output encoding on all user-supplied data reflected in web pages to prevent script injection. Organizations should monitor for suspicious URLs or user activity indicative of phishing attempts exploiting this vulnerability. Deploying Web Application Firewalls (WAFs) with rules targeting reflected XSS patterns can provide interim protection. Security teams should conduct user awareness training to reduce the risk of successful social engineering attacks. Once available, promptly apply official patches or updates from Talent Software to remediate the vulnerability. Additionally, review and harden Content Security Policy (CSP) headers to restrict script execution sources. Regularly audit and test the UNIS application for other potential injection flaws. Logging and monitoring should be enhanced to detect anomalous behaviors associated with XSS exploitation. Finally, consider isolating the UNIS application environment to limit lateral movement if compromise occurs.