Spring Security Advisories

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Spring Framework Escalation via Session Fixation in WebFlux

MEDIUM | JUNE 08, 2026 | CVE-2026-41839

Description

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 Spring Products and Versions

Spring Framework:

  • 7.0.0 - 7.0.7
  • 6.2.0 - 6.2.18
  • 6.1.0 - 6.1.27
  • 5.3.48 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
7.0.8OSS
7.0.7.1Enterprise Support Only
6.2.19OSS
6.2.18.1Enterprise Support Only
6.1.28Enterprise Support Only
5.3.49Enterprise Support Only

No further mitigation steps are necessary.

Credit

This issue was discovered internally.

References

History

  • 2026-06-08: Initial vulnerability report published.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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