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GHSA-4hfh-6x8g-gwpp

Spring Framework Escalation via Session Fixation in WebFlux

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-41839

Packages

EcosystemPackageAffectedFixed in
Maven org.springframework:spring-webflux >= 7.0.0, < 7.0.8 7.0.8
Maven org.springframework:spring-webflux >= 6.2.0, < 6.2.19 6.2.19
Maven org.springframework:spring-webflux >= 6.1.0, <= 6.1.21 no fix listed
Maven org.springframework:spring-webflux <= 5.3.39 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

A WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authenticated user. Affected versions: Spring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.

References

External links from the advisory. They lead to third-party sites.