CVE-2025-11925 is a critical security vulnerability classified under CWE-754, which pertains to improper checks for unusual or exceptional conditions. The flaw exists in Azure Access Technology's BLU-IC2 and BLU-IC4 products up to version 1.19.5, where an API incorrectly sets the Content-Type header to 'text/html' instead of the expected 'application/json'. This incorrect header can cause clients to interpret the response as HTML, enabling an attacker to inject malicious HTML or JavaScript code into the API response. Such injection can lead to cross-site scripting (XSS) attacks, allowing attackers to execute arbitrary scripts in the context of the victim's browser, potentially stealing sensitive information, hijacking sessions, or performing unauthorized actions. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no exploits have been observed in the wild yet, the vulnerability's nature and severity demand urgent attention. The root cause is an improper handling of exceptional conditions in the API response, leading to an incorrect Content-Type header. This issue affects all deployments using the vulnerable versions of BLU-IC2 and BLU-IC4, potentially exposing numerous applications and services relying on these APIs for secure data exchange.

For European organizations, this vulnerability poses a significant risk, especially those utilizing Azure Access Technology's BLU-IC2 and BLU-IC4 products in their cloud infrastructure or application stacks. Exploitation can lead to cross-site scripting attacks, compromising user credentials, session tokens, and sensitive data, thereby breaching confidentiality. Integrity can be undermined by unauthorized script execution that manipulates application behavior or data. Availability may also be affected if attackers leverage the vulnerability to perform denial-of-service attacks or disrupt normal API operations. Sectors such as finance, healthcare, government, and critical infrastructure, which rely heavily on secure cloud services and APIs, are particularly vulnerable. The remote and unauthenticated nature of the exploit increases the likelihood of widespread attacks if the vulnerability is weaponized. Additionally, the potential for supply chain impact exists if third-party applications integrate these vulnerable APIs. The absence of known exploits in the wild currently provides a window for proactive mitigation, but the critical severity demands immediate action to prevent exploitation.

Organizations should immediately audit their use of Azure Access Technology's BLU-IC2 and BLU-IC4 products to identify affected versions up to 1.19.5. Until official patches are released, implement strict input validation and output encoding on all API responses to prevent HTML/JavaScript injection. Configure web application firewalls (WAFs) to detect and block suspicious payloads targeting the vulnerable API endpoints. Monitor network traffic for anomalous requests that could indicate exploitation attempts. Engage with Azure Access Technology support channels to obtain timely patches or workarounds. Review and enforce Content Security Policy (CSP) headers on client applications consuming these APIs to mitigate the impact of potential XSS attacks. Conduct security awareness training for developers and administrators about this vulnerability and safe API handling practices. Finally, establish incident response plans tailored to potential exploitation scenarios involving this vulnerability.