CVE-2026-89106 in UI5
Summary
by MITRE • 10/13/2026
SAP UI5 does not perform sufficient input validation under certain configurations. An attacker with low privileges could submit specially crafted content that is later rendered in a victim's browser. This vulnerability has a low impact on confidentiality and integrity. There is no impact on availability.
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Analysis
by VulDB Data Team • 10/13/2026
The identified security flaw resides within the SAP UI5 framework, specifically concerning insufficient input validation mechanisms under specific configuration states. As a widely adopted technology for building responsive enterprise web applications, SAP UI5 processes user-supplied data to generate dynamic content. The vulnerability arises when the application fails to adequately sanitize or validate inputs before they are processed by the rendering engine. This gap in defensive programming allows an attacker with low privileges to inject malicious payloads into the system. Because the framework subsequently renders this untrusted content within the victim's browser context, it creates a pathway for client-side code execution that bypasses standard security controls designed to prevent such interactions.
From a technical perspective, this vulnerability is characteristic of Cross-Site Scripting (XSS), specifically categorized under CWE-79 in the Common Weakness Enumeration standards. The core issue lies in the failure to neutralize special characters or script blocks contained within user inputs before they are inserted into the Document Object Model. When an attacker submits specially crafted content, such as JavaScript snippets embedded in form fields or URL parameters, the application treats this input as legitimate code rather than data. Consequently, when another user views the affected page, their browser executes the injected scripts. This execution occurs within the security context of the trusted SAP UI5 domain, allowing the malicious script to access cookies, session tokens, and other sensitive information stored locally by the browser.
The operational impact of this vulnerability is primarily focused on confidentiality and integrity, with no direct effect on availability. The low impact rating reflects the requirement for an attacker to have at least some level of authenticated access or interaction capability within the application environment. Once exploited, the primary consequence is the potential theft of sensitive user data, including session identifiers that could lead to account takeover attacks. Additionally, attackers may manipulate page content or perform actions on behalf of the victim without their knowledge, thereby compromising the integrity of the user experience and potentially leading to further social engineering or phishing campaigns. Since the attack relies on client-side execution rather than server resource exhaustion, service availability remains unaffected during these incidents.
To mitigate this risk, organizations must ensure that SAP UI5 applications are configured with strict input validation policies. This involves implementing robust output encoding techniques such as HTML entity encoding for all user-supplied data before it is rendered in the browser context. Developers should also leverage Content Security Policy headers to restrict the sources from which scripts can be loaded and executed, thereby limiting the damage even if an injection attempt succeeds. Regular security assessments and code reviews focusing on input handling are essential to identify and remediate such weaknesses. Furthermore, keeping SAP UI5 libraries up to date with the latest patches provided by SAP ensures that known flaws in validation logic are addressed promptly. Aligning development practices with OWASP guidelines for preventing XSS attacks will significantly reduce the attack surface associated with this type of vulnerability.