Fluid Attacks Database

Description

Spring Framework Escalation via Session Fixation in WebFlux 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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 12	libspring-java	=4.3.30-2 \|\| =4.3.30-3 \|\| =4.3.30-4	-
debian 13	libspring-java	=4.3.30-3 \|\| =4.3.30-4	-
debian 11	libspring-java	=4.3.30-1 \|\| =4.3.30-2 \|\| =4.3.30-3 \|\| =4.3.30-4	-
debian 14	libspring-java	=4.3.30-3 \|\| =4.3.30-4	-
maven	org.springframework:spring-webflux	>=7.0.0 <7.0.8 \|\| >=6.2.0 <6.2.19 \|\| >=6.1.0 <=6.1.21 \|\| >=0 <=5.3.39	7.0.8, 6.2.19

Aliases

1. CVE-2026-418392. NVD-2026-418393. OSV-DEBIAN-2026-418394. OSV-2026-418395. GCVE-2026-418396. SECURITY-TRACKER-CVE-2026-41839

References

1. https://github.com/spring-projects/spring-framework/issues/367422. https://github.com/spring-projects/spring-framework/issues/367433. https://github.com/spring-projects/spring-framework/commit/b8ddd2c690fe3f00bb5e3d9f913a37504aab49a04. https://github.com/spring-projects/spring-framework/commit/d72da90d3a562632e2b565113813f7b4a31f87175. https://github.com/spring-projects/spring-framework/releases/tag/v6.2.196. https://github.com/spring-projects/spring-framework/releases/tag/v7.0.87. https://spring.io/security/cve-2026-41839

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