EUVD-2026-66861
GHSA-vw3r-pj6g-mjg8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Network-reachable WebSocket endpoint, no auth to connect, headers may carry high-value credentials; no integrity or availability impact applies.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4DescriptionCVE.org
A Spring WebFlux application that supports WebSocket connections may expose indirectly sensitive user information by including request headers in an exception reason. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49 Spring Framework 5.2.25.RELEASE and earlier
AnalysisAI
Spring WebFlux applications that enable WebSocket connections leak request headers - potentially containing Authorization tokens, session cookies, or API keys - through exception reason messages exposed over the WebSocket channel. All maintained Spring Framework release trains from 5.2.x through 7.0.x are affected, covering the vast majority of actively deployed Spring reactive applications. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) the target application must use the Spring WebFlux reactive stack - not Spring MVC; (2) the application must have WebSocket support explicitly configured and expose at least one WebSocket endpoint to the attacker; (3) the attacker must be able to reach that endpoint over the network and trigger a server-side exception during WebSocket handshake or session handling. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) scores 7.5 and implies unauthenticated network exploitation with high confidentiality impact - technically accurate if the exposed headers include bearer tokens or session cookies. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade to a patched Spring Framework release as described in the vendor advisory at https://spring.io/security/cve-2026-47893. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Spring Framework applications running versions 5.2.x through 7.0.x that expose WebSocket endpoints and document which are internet-facing versus internal. …
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External POC / Exploit Code
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