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CVE-2026-27680: CSS Injection vulnerability in SAP NetWeaver Application Server ABAP

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-14 · updated 2026-10-26
• Weakness: CWE-276

Description

Due to improper input handling under certain conditions, SAP NetWeaver Application Server ABAP allows an attacker to inject custom Cascading Style Sheets (CSS) data into a web page served by the application. When a user accesses or clicks the affected page, the injected CSS is executed. As a result, the issue has a low impact on confidentiality, while integrity and availability are not impacted.

Affected products

• SAP_SE SAP NetWeaver Application Server for ABAP and ABAP Platform: 758, 816

References

• https://me.sap.com/notes/3665042
• https://url.sap/sapsecuritypatchday

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