CVE-2026-23686: 
SAP NetWeaver Application Server Java Analisi e mitigazione delle vulnerabilità

CVE-2026-23686 is a CRLF Injection vulnerability in SAP NetWeaver Application Server Java (version 7.50) that allows an authenticated attacker with administrative access to inject untrusted entries into generated configuration by submitting specially crafted content. Disclosed on February 10, 2026, and patched on SAP Security Patch Day in February 2026, the vulnerability affects only version 7.50 of SAP NetWeaver AS Java. It carries a CVSS v3.1 base score of 3.4 (Medium) (Red Hat CVE, SAP Patch Day).

The vulnerability is classified under CWE-113 (Improper Neutralization of CRLF Sequences in HTTP Headers / HTTP Response Splitting) and CWE-436 (Interpretation Conflict). An authenticated administrator can submit specially crafted input containing carriage return and line feed (CRLF) characters, which the application fails to properly neutralize before incorporating the data into generated configuration files or HTTP responses. This allows the attacker to inject arbitrary entries into application-controlled settings, potentially enabling HTTP response splitting or configuration manipulation. Exploitation requires both high privileges (administrative access) and user interaction, significantly limiting the attack surface (Red Hat CVE, SAP Patch Day).

Successful exploitation results in a low impact on integrity through manipulation of application-controlled configuration settings; confidentiality and availability are not affected. Because the attacker can inject untrusted entries into generated configuration, there is a risk of altering application behavior or HTTP response headers in ways that could facilitate downstream attacks such as cache poisoning or session fixation against other users. The scope is marked as Changed, indicating that the impact can extend beyond the vulnerable component itself, though the overall severity remains limited given the high privilege requirement (Red Hat CVE).

SAP released a patch for this vulnerability as part of SAP Security Patch Day in February 2026; organizations should apply the relevant SAP Security Note available via the SAP Support Portal (SAP Patch Day). As interim measures, restrict administrative access to SAP NetWeaver AS Java to only authorized and trusted personnel, implement input validation and output encoding to neutralize CRLF sequences, and monitor configuration changes for unauthorized modifications. Given the medium severity and high privilege requirement, patching should be prioritized as part of routine SAP maintenance cycles (Red Hat CVE).

The vulnerability was covered as part of broader SAP February 2026 Patch Day roundups by security firms including Onapsis and SecurityBridge, which noted it among several lower-severity issues addressed that month (Onapsis Blog, SecurityBridge Blog). RedRays also published a patch day summary referencing the fix (RedRays Blog). General community sentiment treats this as a routine, low-risk patch given the medium CVSS score and the administrative access prerequisite.