EUVD-2026-66680
GHSA-6p7h-426w-rcrx
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Redirect-following is a non-default opt-in setting making AC:H; description supports only credential disclosure so I:N rather than I:L.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
Lifecycle Timeline
2DescriptionCVE.org
In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
AnalysisAI
Credential leakage in the Reactor Netty WebSocket client exposes authentication data when a WebSocket handshake is redirected to a different origin and the HTTP client has been explicitly configured to follow redirects. Affected release trains span Reactor Netty 1.0.x through 1.3.6, covering multiple active Spring ecosystem versions maintained by VMware. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two explicit, non-default conditions must both be satisfied for exploitation: (1) the Reactor Netty HTTP client must have been explicitly configured to follow redirects - this is an opt-in setting, not the default behavior, so applications using out-of-the-box Reactor Netty configuration are not vulnerable; and (2) a WebSocket handshake must be subject to a redirect targeting a different origin, which an attacker could achieve via a compromised intermediary, DNS manipulation, or by controlling the initial endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 6.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) captures the network-accessible, cross-origin nature of the flaw and the scope change resulting from credential exposure to a different origin. … 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 | Upgrade Reactor Netty to the patched release for your active version train per the vendor advisory at https://spring.io/security/cve-2026-47848 - exact fixed versions (e.g., 1.3.7+, 1.2.19+, or a 1.0.x successor) must be confirmed directly from that advisory, as no specific fix version was independently confirmed in the available intelligence data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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