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CVE-2026-58240, known as S4GET, is a critical missing-authentication vulnerability in SAP NetWeaver Message Server. The Message Server insufficiently validates the authenticity of internal application-server components during component registration. Consequently, an unauthenticated network attacker can submit a crafted registration request and register an unauthorized component as a trusted peer. Affected versions include SAP NetWeaver Message Server KERNEL 9.16, 9.18, 9.19, and 9.20.
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No public exploit code observed for this vulnerability.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical missing-authentication-check vulnerability in SAP NetWeaver's modern kernel that enables remote unauthenticated attackers to register unauthorized components and perform unauthorized actions. SAP S/4HANA 2025 and earlier releases are affected.
A critical (CVSS 3.1 9.8) improper/missing authentication flaw affecting SAP NetWeaver Message Server component registration. It permits a remote unauthenticated attacker to register a rogue application-server component as a trusted peer, potentially enabling message interception or manipulation, denial of service, data exposure, and lateral movement.
A critical unauthenticated network-accessible authentication-validation weakness in SAP NetWeaver Message Server that could allow registration of an unauthorized application-server component and subsequent unauthorized actions in the application environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.