WebFlux Application Vulnerability in Jetty 12 Core by Spring Framework
CVE-2026-47889

7.5HIGH

Key Information:

Vendor

Spring

Status
Spring Framework
Vendor
CVE Published:
27 August 2026

What is CVE-2026-47889?

A vulnerability has been identified in WebFlux applications using the Jetty 12 Core reactive adapter. This issue arises due to the improper serialization of response cookies, specifically missing the 'sameSite' attribute. This can lead to potential security risks as it may allow cross-origin requests to manipulate cookies, thereby compromising user session data.

Affected Version(s)

Spring Framework 7.0.0 <= 7.0.8

Spring Framework 6.2.0 <= 6.2.19

References

https://spring.io/security/cve-2026-47889

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.