Spring Framework WebFlux SameSite Cookies Missing (6.2.0-6.2.19, 7.0.0-7.0.8)
CVE-2026-47889 Published on August 27, 2026
Spring Framework sameSite Attribute Dropped in JettyCoreServerHttpResponse
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
Vulnerability Analysis
CVE-2026-47889 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
Sensitive Cookie with Improper SameSite Attribute
The SameSite attribute for sensitive cookies is not set, or an insecure value is used. The SameSite attribute controls how cookies are sent for cross-domain requests. This attribute may have three values: 'Lax', 'Strict', or 'None'. If the 'None' value is used, a website may create a cross-domain POST HTTP request to another website, and the browser automatically adds cookies to this request. This may lead to Cross-Site-Request-Forgery (CSRF) attacks if there are no additional protections in place (such as Anti-CSRF tokens).
Products Associated with CVE-2026-47889
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Affected Versions
Spring Framework:- Version 7.0.0, <= 7.0.8 is affected.
- Version 6.2.0, <= 6.2.19 is affected.