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Spring Framework CVE-2026-47889

| EUVDEUVD-2026-66857 HIGH
Sensitive Cookie with Improper SameSite Attribute (CWE-1275)
2026-08-27 security@vmware.com GHSA-53cv-4frm-9p27
7.5
CVSS 3.1 · Vendor: vmware
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Severity by source

Vendor (vmware) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Cross-site cookie abuse requires a victim to visit an attacker-controlled page, making UI:R more accurate than the vendor's UI:N; all other metrics align with the network-delivered, unauthenticated, confidentiality-only impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Aug 27, 2026 - 16:31 vuln.today
CVE Published
Aug 27, 2026 - 06:17 cve.org
HIGH 7.5
CVE Published
Aug 27, 2026 - 06:17 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

A WebFlux application running on the Jetty 12 Core reactive adapter serializes response cookies without the sameSite attribute. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19

AnalysisAI

WebFlux applications in Spring Framework running on the Jetty 12 Core reactive adapter omit the SameSite cookie attribute from serialized response cookies, exposing session and authentication cookies to cross-site request contexts. Affected versions span Spring Framework 6.2.0-6.2.19 and 7.0.0-7.0.8, covering a substantial footprint of reactive Java deployments on Jetty 12. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) the Spring Framework application must use the WebFlux reactive stack - not the traditional Spring MVC servlet stack; (2) the WebFlux application must be configured to run on the Jetty 12 Core reactive adapter specifically, rather than the default Netty transport or Undertow; and (3) the application must issue cookies containing sensitive material (e.g., session identifiers, authentication tokens). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) rates this as high severity, primarily driven by C:H and the fully open access metrics. … 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 Spring Framework to a version beyond the affected ranges - beyond 7.0.8 for the 7.0.x train and beyond 6.2.19 for the 6.2.x train - per the vendor advisory at https://spring.io/security/cve-2026-47889. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, query deployment systems and container registries for Spring Framework versions 6.2.0-6.2.19 and 7.0.0-7.0.8 paired with Jetty 12 reactive adapters to establish affected asset inventory. …

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CVE-2026-47889 vulnerability details – vuln.today

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