CVE-2026-27685

CriticalRCE

Published: 10 March 2026

Published

10 March 2026

Modified

11 March 2026

KEV Added

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Patch

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CVSS Score 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.0006 19.4th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27685 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Sap (inferred from references). Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 19.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and AC-6 (Least Privilege).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation for Privilege Escalation (T1068) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly mitigates the deserialization vulnerability (CWE-502) by requiring timely remediation through application of SAP patches as specified in Note 3714585.

SI-10 Information Input Validation partial match

prevent

Validates and sanitizes uploaded content in the Enterprise Portal Administration interface to block malicious deserialization payloads.

AC-6 Least Privilege partial match

prevent

Limits privileged user access (PR:H requirement) to the vulnerable administration interface, reducing the attack surface for exploitation.

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Deserialization of attacker-controlled content uploaded via the privileged admin interface (AV:N, PR:H) directly enables RCE and scope change to full host compromise, mapping to exploitation of a network-accessible application (T1190) for privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

SAP NetWeaver Enterprise Portal Administration is vulnerable if a privileged user uploads untrusted or malicious content that, upon deserialization, could result in a high impact on the confidentiality, integrity, and availability of the host system.

Deeper analysisAI

SAP NetWeaver Enterprise Portal Administration contains a deserialization vulnerability (CWE-502) that affects systems where a privileged user can upload untrusted or malicious content. Upon deserialization of this content, an attacker could achieve a high impact on the confidentiality, integrity, and availability of the host system. The vulnerability, tracked as CVE-2026-27685, was published on 2026-03-10 and carries a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H), indicating critical severity.

Exploitation requires an attacker to possess privileged user access (PR:H) to the Enterprise Portal Administration interface over the network (AV:N). By uploading specially crafted malicious content, the attacker can trigger unsafe deserialization, leading to scope expansion (S:C) and full compromise of the host system, including high-impact unauthorized disclosure, modification, and disruption of data and services.

SAP advisories provide mitigation details in Note 3714585 (https://me.sap.com/notes/3714585) and as part of the SAP Security Patch Day (https://url.sap/sapsecuritypatchday), recommending application of available patches to address the deserialization flaw and prevent privileged user exploitation.