Description

SAP UI5 does not sufficiently validate the parent frame's origin against the configured allowlist. An unauthenticated attacker could host a malicious page to bypass framing restrictions. If an authenticated victim visits the attacker's page and interacts with it, the attacker could trick the victim into performing unintended actions, resulting in a low impact on integrity. There is no impact on confidentiality and availability.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-09-08T01:17:55.653Z",
  "pubdate": "2026-09-08T01:17:55.653Z",
  "executiveSummary": "This vulnerability involves insufficient validation of the parent frame's origin within SAP UI5, specifically concerning cross-origin framing restrictions. The flaw allows an unauthenticated remote attacker to bypass defined allowlist protections by hosting a malicious page that embeds the SAP UI5 application.\nBy leveraging this framing bypass, an attacker can perform clickjacking or UI redressing attacks against an authenticated victim. If a victim visits the attacker-controlled page while having an active session in the target SAP UI5 application, the attacker can induce the victim to perform unintended actions.\nThe impact of this vulnerability is categorized as low regarding data integrity, with no measurable impact on system confidentiality or availability. Exploitation requires user interaction, as the victim must navigate to and interact with the attacker-controlled malicious content while maintaining an authenticated session with the vulnerable SAP UI5 instance.",
  "technicalDetails": "The root cause of this vulnerability lies in the improper implementation of origin-based security checks within the SAP UI5 framework's framing protection mechanism. Specifically, the framework fails to rigorously validate the parent frame's origin against the configured allowlist before rendering the application within an iframe. This lapse allows an attacker to bypass security headers or client-side checks that are intended to prevent unauthorized embedding of the application.\nThe exploitation flow proceeds as follows: First, the attacker hosts a malicious website containing a cross-origin iframe that points to the legitimate SAP UI5 application URL. Because the framework does not correctly enforce the origin allowlist during the initial frame-ancestor negotiation, the browser permits the SAP UI5 content to render within the attacker's iframe.\nSecond, the attacker overlays transparent or misleading UI elements on top of the embedded SAP UI5 application, a technique known as UI redressing or clickjacking. The attacker waits for an authenticated victim to visit the malicious site. If the victim has an active session with the target SAP UI5 environment, their browser will automatically include session cookies in the request to the framed SAP UI5 application.\nThird, once the victim interacts with the malicious page, they are inadvertently performing operations within the SAP UI5 application as the authenticated user. Because the application believes it is being accessed legitimately, it processes these actions as authenticated requests. The resulting impact is localized to the specific functionality the attacker lures the victim into triggering, which may result in unauthorized state changes or data modifications within the application context.\nThe vulnerability is restricted by the requirement that the victim must be authenticated at the time of the attack. Furthermore, the absence of impact on confidentiality and availability indicates that the exploit does not permit unauthorized data extraction or service disruption. The failure is strictly focused on the lack of robust origin validation, which serves as a security boundary for cross-origin interactions. The framework's internal logic for validating the 'ancestor' origin is clearly circumvented, allowing external domains to load the application context in a manner that bypasses expected security policies."
}