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Full vulnerability report · 2026
CVE-2026-58240High confidence

Missing Authentication check in SAP NetWeaver (Message Server)

SAP SE · SAP NetWeaver (Message Server)

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Fix not verified
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-72575

No EUVD known-exploited evidence

SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
9.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Fix not verified
01

What, why and how

SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.

What

SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.

Why

The product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.

Why

The product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Use of Single-factor Authentication → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-308 ↗

CWE-308: Use of Single-factor Authentication. The product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-308
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-72575Official EUVD mapping

SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3220SAP Patch Day September 2026: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in SAP Software ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Berechtigungen zu erweitern, vertrauliche Informationen offenzulegen oder zu manipulieren, SQL-Injection-Angriffe durchzuführen oder einen Denial-of-Service-Zustand zu verursachen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260909Security Bulletin 9 Sep 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 9 Sep 2026, published on 9 September 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
INCIBE-CERT · Spanish · actualizacion-de-seguridad-de-sap-de-septiembre-de-2026Actualización de seguridad de SAP de septiembre de 2026

SAP ha publicado su boletín mensual en el que se incluyen 19 vulnerabilidades: 4 de severidad crítica, 4 de severidad alta, 10 de severidad media y 1 de severidad baja. Estas vulnerabilidades afectan a varios de sus productos y su explotación podría permitir a un atacante explotar vulnerabilidades de Cross-Site Request Forgery (CSRF), control inadecuado de acceso, corrupción de memoria, deserialización insegura, falsificación de solicitudes del lado del servidor (SSRF), falta de comprobación de autenticación, falta de comprobación de autorización, inyección de salto de líneas debido al uso de componentes de Jetty, mala configuración de seguridad debido al uso de Apache Log4j, revelación de credenciales, revelación de información, vulnerabilidad de clickjacking , vulnerabilidad de denegación de servicio, vulnerabilidad de entidades XML externas (XXE) y vulnerabilidad de inyección SQL.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1134Multiples vulnérabilités dans les produits SAP

De multiples vulnérabilités ont été découvertes dans les produits SAP. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un déni de service à distance.

Official advisory ↗
CSIRT Italia · Italian · sap-security-patch-day-20SAP Security Patch Day

Nel dettaglio, la vulnerabilità identificata tramite la CVE-2026-2332 , di tipo " HTTP Request/Response Smuggling " e con score pari a 7.4, è dovuta all'uso di componenti Jetty vulnerabili alla " CRLF Injection (Carriage Return Line Feed Injection) " che interessa i prodotti SAP Commerce Cloud (Search and Navigation). I caratteri CR e LF vengono utilizzati dai protocolli HTTP per delimitare righe e header. Quando un'applicazione non filtra correttamente input controllabili dall'utente, un attaccante può inserire CRLF all'interno di: URL parametri HTTP header richieste API e modificare la struttura della risposta HTTP generata dal server.

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0356Kwetsbaarheden verholpen in diverse SAP-producten

De kwetsbaarheid met kenmerk CVE-2026-44756 heeft CVSS-score van 10. Het betreft een geheugenveiligheidsprobleem in de EPP processing library dat kan worden geactiveerd door niet-geauthenticeerde aanvallers die malformed EPP headers versturen. Deze geheugenbeschadiging kan leiden tot ongedefinieerd gedrag, wat de vertrouwelijkheid, integriteit en beschikbaarheid van de applicatie kan beïnvloeden. De kwetsbaarheid ontstaat door onjuiste verwerking van EPP headers binnen de SAP EPP processing library. Exploitatie vereist geen authenticatie. De kwetsbaarheid met kenmerk CVE-2026-58240 heeft CVSS-score van 9.8. Het betreft het ontbreken van een authenticatiemechanisme bij de registratie van interne applicatieservercomponenten. Hierdoor valideert het systeem niet correct of de componenten legitiem zijn. Een niet-geauthenticeerde aanvaller met netwerktoegang kan hierdoor ongeautoriseerde componenten registreren binnen de Message Server-omgeving. Dit kan leiden tot compromittering van de vertrouwelijkheid, integriteit en beschikbaarheid van de getroffen SAP NetWeaver-systemen. De kwetsbaarheid met kenmerk CVE-2026-76969 heeft CVSS-score van 9.4. De kwetsbaarheid maakt het mogelijk voor niet-geauthenticeerde aanvallers om gevoelige credentials te verkrijgen. Dit kan leiden tot ongeautoriseerde toegang en manipulatie van tenantgegevens. De kwetsbaarheid betreft credential disclosure in multitenant CAP-applicaties en beïnvloedt de vertrouwelijkheid, integriteit en beschikbaarheid van de getroffen systemen. De kwetsbaarheid met kenmerk CVE-2026-66768 heeft CVSS-score van 9.0. De kwetsbaarheid betreft een onjuiste toegangcontrole en het niet correct afdwingen van trust level policies in SAP GUI for Java. Hierdoor kan een aanvaller met lage privileges willekeurige commando's uitvoeren door misbruik te maken van zwakheden in de backend verwerking van trust policies. Dit beïnvloedt de integriteit van het beveiligingsmodel van het systeem. De overige kwetsbaarheden variëren in ernst van middelmatig tot hoog en betreffen diverse beveiligingsproblemen zoals: - niet juist uitvoeren van autorisatiecontroles in SAP ABAP Developer Tools - XML External Entity (XXE) in SAP Integration Suite - onveilige deserialisatie in SAP NetWeaver Business Client - geheugenbeschadiging in SAP NetWeaver Application Server for ABAP en ABAP Platform - CRLF-injectie door het gebruik van Jetty-componenten in SAP Commerce Cloud - informatielek in SAP Web Dispatcher, Internet Communication Manager en SAP Content Server - SQL-injectie in SAP S/4HANA (Intercompany Matching and Reconciliation) - Server-Side Request Forgery (SSRF) in SAP Manufacturing Integration and Intelligence Deze kwetsbaarheden kunnen leiden tot privilege-escalatie, ongeautoriseerde toegang, informatielekken, gegevensmanipulatie en verstoring van de beschikbaarheid. Meerdere kwetsbaarheden kunnen zonder authenticatie worden uitgebuit. De kwetsbaarheden treffen diverse SAP-componenten, waaronder SAP ABAP Developer Tools, SAP Integration Suite, SAP NetWeaver, SAP Commerce Cloud, SAP Web Dispatcher, SAP S/4HANA en SAP Manufacturing Integration and Intelligence.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
SAP NetWeaver (Message Server): KERNEL 9.16, 9.18, 9.19, 9.20
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 8 Sept 2026 · Last source change 9 Sept 2026, 04:25 UTC · CWE-308 · Use of Single-factor Authentication

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-09
European sourceENISA EUVD · EUVD-2026-72575
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
  2. ENISA EUVD mappingEUVD-2026-72575 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-72575"}
    ENISA EUVD ↗
  3. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-72575↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-58240 · cve.blacktree.nl