This vulnerability (CVE-2026-11878) in OpenText Access Manager arises due to improper neutralization of input during web page generation, classified as CWE-79 (Cross-Site Scripting). It affects version 5.1 of the product. The CVSS 4.0 base score is 8.2, indicating high severity, with network attack vector, high attack complexity, and no privileges or user interaction required. The vulnerability allows execution of malicious scripts in the context of the vulnerable web application, potentially impacting confidentiality and integrity. No vendor advisory or patch is currently available, and no known exploits are reported in the wild.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected OpenText Access Manager web application. This may lead to unauthorized actions or data exposure within the application session. The CVSS score of 8.2 reflects a high impact on confidentiality and integrity with no required privileges or user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider applying input validation or output encoding controls at the application or web server level to mitigate XSS risks. Monitor OpenText communications for updates on patches or official mitigations.