Allowlist Bypass in setThemeRoot() Enables Cross-Origin CSS Injection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-44767
StatePUBLISHED
Assignersap
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 01:16:18 UTC
Updated2026-07-14 16:46:49 UTC
DescriptionsetThemeRoot() failed to enforce the sap-allowed-theme-origins allowlist. An attacker-controlled absolute cross-origin URL could be stored and used directly to construct a <link rel=stylesheet> element, even when no <meta name=sap-allowed-theme-origins> tag was present in the document. The same bypass was reachable via the ?sap-themeRoot URL parameter.Exploitation requires attacker-influenced input (e.g., a URL query parameter, tenant configuration, or user-supplied setting) to reach setThemeRoot(). A successful exploit allows an attacker to inject arbitrary CSS into the victim page, enabling:- UI redressing and clickjacking- Phishing overlays- Visual defacement- Limited data exfiltration via CSS attribute selectors targeting predictable DOM content

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.001810000 probability, percentile 0.078430000 (date 2026-07-14)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNACVSS6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SAP SE @ui5/webcomponents-base affected @ui5/webcomponents-base < 2.21.0 Not specified

References

ReferenceSourceLinkTags
github.com/UI5/webcomponents/security/advisories/GHSA-p8gx-753q-v89p [email protected] github.com
url.sap/sapsecuritypatchday [email protected] url.sap
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