> ## Content Index > Fetch the complete content index at: https://darkwebinformer.com/llms.txt > Use this file to discover other available public pages before exploring further. # XML Signature Wrapping Vulnerability in SAP NetWeaver ABAP Enables Identity Tampering and Unauthorized Access (CVE-2026-23687) - URL: https://darkwebinformer.com/xml-signature-wrapping-vulnerability-in-sap-netweaver-abap-allegedly-enables-identity-tampering-and-unauthorized-access-cve-2026-23687/ - Published: 2026-02-10T17:50:12.000Z - Updated: 2026-02-10T17:52:01.000Z - Author: Dark Web Informer - Tags: Vulnerabilities # XML Signature Wrapping Vulnerability in SAP NetWeaver ABAP Enables Identity Tampering and Unauthorized Access (CVE-2026-23687) February 10, 2026 • Dark Web Informer • Vulnerability Intelligence ⚠ CVSS 8.8 — High CVE CVE-2026-23687 Type XML Signature Wrapping Auth Low Privileges Vendor SAP SE ## Vulnerability Overview SAP has disclosed a high-severity XML Signature Wrapping vulnerability in **SAP NetWeaver Application Server ABAP and ABAP Platform** as part of its **February 2026 Security Patch Day**. Tracked as **CVE-2026-23687** with a **CVSS score of 8.8**, this flaw allows an authenticated attacker with normal (low) privileges to manipulate signed XML documents and bypass identity verification controls — potentially gaining unauthorized access to sensitive user data and disrupting normal system operations. The vulnerability targets the XML signature verification process within the ABAP platform. An attacker with valid SAP credentials can obtain a legitimately signed message, modify its contents, and resubmit the tampered document to the verifier. Because the signature validation logic fails to properly detect the manipulation, the system accepts the forged XML as authentic — effectively allowing the attacker to impersonate other users or escalate their own privileges. SAP NetWeaver ABAP is one of the most widely deployed enterprise application platforms in the world. It serves as the backbone for countless critical business processes across finance, manufacturing, retail, healthcare, and government sectors. The combination of network-based attack vector, low attack complexity, and high impact across confidentiality, integrity, and availability makes this vulnerability a serious concern for any organization running affected SAP infrastructure. ## Technical Details CVE-2026-23687 exploits a weakness in how the ABAP platform handles XML digital signatures. XML Signature Wrapping (XSW) attacks work by restructuring a signed XML document so that the signature remains mathematically valid, but the verifier processes attacker-controlled content instead of the originally signed data. This is a well-known class of vulnerability that has historically affected SAML-based authentication systems, web services, and identity federation protocols. In this case, an attacker who holds valid SAP credentials — even low-privileged ones — can intercept or obtain a legitimately signed XML message and restructure it to inject tampered identity information. When the modified document is sent to the verification endpoint, the system accepts it, potentially granting the attacker access under a different identity or with elevated permissions. Attack Vector Network (Remote) Attack Complexity Low Privileges Required Low User Interaction None CVSS Score 8.8 — High Impact C:H / I:H / A:H Successful exploitation could result in: - **Identity spoofing** — Tampered identity information is accepted by the verifier, allowing the attacker to act as another user - **Unauthorized data access** — Sensitive user data and business-critical information becomes accessible - **Lateral movement** — If trusted downstream components rely on the compromised identity data, the attacker may pivot within the SAP landscape - **Service disruption** — Manipulation of identity claims can disrupt normal system operations and business processes ## Affected Versions The vulnerability affects a broad range of SAP\_BASIS versions spanning legacy and current releases: SAP\_BASIS 700 SAP\_BASIS 701 SAP\_BASIS 702 SAP\_BASIS 731 SAP\_BASIS 740 SAP\_BASIS 750 SAP\_BASIS 751 SAP\_BASIS 752 SAP\_BASIS 753 SAP\_BASIS 754 SAP\_BASIS 755 SAP\_BASIS 756 SAP\_BASIS 757 SAP\_BASIS 758 SAP\_BASIS 804 SAP\_BASIS 816 SAP\_BASIS 916 SAP\_BASIS 917 SAP\_BASIS 918 **Note:** The breadth of affected versions — from SAP\_BASIS 700 through 918 — means virtually every SAP NetWeaver ABAP deployment in active use is potentially impacted. Organizations should verify their SAP\_BASIS version and cross-reference with SAP Security Note #3697567 immediately. ## Patch & Remediation SAP Security Note #3697567 This vulnerability is addressed by **SAP Security Note #3697567**, released as part of SAP's **February 2026 Patch Day**. The note patches the XML Signature verification logic to properly detect and reject manipulated signed XML documents. A workaround is available but does not cover all usage scenarios involving signed XML documents — SAP recommends applying the full patch. ## February 2026 Patch Day Context CVE-2026-23687 is one of several high-impact vulnerabilities addressed in SAP's February 2026 Patch Day, which included **29 new and updated security notes** in total. Other notable patches released alongside this advisory include: - **SAP Security Note #3697099** (CVSS 9.9) — Critical Code Injection in SAP CRM and S/4HANA allowing execution of arbitrary SQL statements - **SAP Security Note #3674774** (CVSS 9.6) — Missing Authorization Check in SAP NetWeaver AS ABAP enabling unauthorized background RFC calls - **SAP Security Note #3705882** (CVSS 7.7) — Information Disclosure in SAP Solution Tools Plug-In (ST-PI) - **SAP Security Note #3692405** (CVSS 7.4) — SSL Trust Validation Bypass in SAP Commerce Cloud - **SAP Security Note #3674246** (CVSS 7.3) — Open Redirect in SAP BusinessObjects BI Platform Organizations running SAP environments should review the full February 2026 Patch Day bulletin and prioritize remediation based on their specific deployment landscape. ## Detection Indicators Signs of Potential Exploitation - Successful processing of tampered signed XML documents where identity attributes differ from signed claims - Anomalous authentication events where user identity does not match the expected signed assertion - Repeated signature verification faults followed by privileged data access or system calls - Unexpected changes in user session context or privilege levels after XML-based authentication ## Recommendations 1. **Apply SAP Security Note #3697567 immediately.** Test in a staging environment before production rollout. The available workaround does not cover all signed XML usage scenarios. 2. **Restrict network exposure.** Limit access to ABAP signing and verification endpoints. Enforce least privilege and network segmentation for SAP interfaces. 3. **Audit identity and authentication logs.** Look for mismatches between signed data and identity claims, unusual privilege escalations, or unexpected user context switches. 4. **Review the full February 2026 Patch Day.** Multiple critical and high-severity vulnerabilities were patched — prioritize based on your SAP landscape exposure. 5. **Plan for downtime.** Schedule remediation with a defined maintenance window and verify rollback procedures before deploying patches to production. ## References - [SAP Security Patch Day — February 2026](https://support.sap.com/en/my-support/knowledge-base/security-notes-news/february-2026.html) - [Onapsis — SAP February 2026 Patch Day Analysis](https://onapsis.com/blog/sap-security-notes-february-2026-patch-day/) - [RedPacket Security — CVE-2026-23687 Alert](https://www.redpacketsecurity.com/cve-alert-cve-2026-23687-sap-se-sap-netweaver-as-abap-and-abap-platform/) - [SAP Security Note #3697567 (requires SAP login)](https://me.sap.com/notes/3697567)