CVE-2026-47889 Spring Framework sameSite Attribute Dropped in JettyCoreServerHttpResponse
Attackers can bypass SameSite cookie protections in WebFlux applications on Jetty, potentially enabling CSRF attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47889?
CVE-2026-47889 is a high-severity vulnerability in Vmware Spring Framework, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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
Weakness: CWE-1275
Which versions are affected by CVE-2026-47889?
It affects 1 product.
Products include Vmware Spring Framework.
How do I fix CVE-2026-47889?
Upgrade to a fixed version.
Is CVE-2026-47889 being exploited?
There is no known exploitation of CVE-2026-47889 in the wild and no public exploit code.
Other vulnerabilities in Vmware Spring Framework
- CVE-2026-47884 Spring Framework Improper Path Limitation in XsltView
- CVE-2026-47890 Spring Framework Server Sent Event stream corruption while rendering fragments
- CVE-2026-47891 Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder
- CVE-2026-47892 Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
- CVE-2026-59313 Server Sent Event stream corruption in Spring MVC functional web framework
Sources
Also known as CLEANSTART-2026-BU33192, CLEANSTART-2026-LY84438, CLEANSTART-2026-MK68457, CLEANSTART-2026-SQ92018, GHSA-53cv-4frm-9p27, UBUNTU-CVE-2026-47889.