[NEW] [medium] IBM WebSphere Application Server: Multiple vulnerabilities enable Denial of Service

mediumCVE-2026-50645 CVE-2026-9171 CVE-2026-9322

An attacker can exploit multiple vulnerabilities in IBM WebSphere Application Server to conduct a Denial of Service attack.

CSIRTS triage

vendor: IBM product: WebSphere Application Server Denial of service

What: Multiple vulnerabilities in IBM WebSphere Application Server enable denial of service attacks.
Who is affected: Deployments of IBM WebSphere Application Server are affected.
Urgency: Medium severity; not currently exploited but DoS impact warrants timely patching.
Action: Apply vendor security patches for CVE-2026-50645, CVE-2026-9171, and CVE-2026-9322 as soon as available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-31
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2606

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-506450.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-91710.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-93220.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50645	coverage & exploitation status	NVD · CVE.org
CVE-2026-9171	coverage & exploitation status	NVD · CVE.org
CVE-2026-9322	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-9322: IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17…nvd
medium[UPDATE] [medium] Apache CXF: Multiple vulnerabilitiescert-bund
highCVE-2026-9171: IBM PowerVM Novalink are vulnerable to a denial of service, caused by sending a specially-craft…nvd
unknownMultiple vulnerabilities in IBM products (July 17, 2026)cert-fr-avis
unknownMultiple vulnerabilities in IBM products (July 10, 2026)cert-fr-avis
unknownMultiple vulnerabilities in IBM products (July 3, 2026)cert-fr-avis
unknownIBM WebSphere Products Multiple Vulnerabilitieshkcert
highGHSA-ghvc-7hp8-2g2v: Apache cxf-core: No restriction on attachment headers per messageghsa

Recent advisories for IBM WebSphere Application Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-8400: IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Co…nvd · 2026-08-05
high[NEW] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-08-05
medium[NEW] [medium] IBM WebSphere Application Server: Vulnerability allows bypassing security measurescert-bund · 2026-08-05
medium[NEW] [medium] IBM WebSphere Application Server Liberty: Multiple vulnerabilities allow denial of servicecert-bund · 2026-07-31
high[UPDATE] [high] IBM WebSphere Application Server and Application Server Liberty: Multiple vulnerabilitiescert-bund · 2026-07-31
highCVE-2026-11536: IBM WebSphere Application Server 9.0, and 8.5 is affected by a remote code execution vulnerabi…nvd · 2026-07-30