Spring Security Advisories

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Spring Framework Predictable Session ID in WebSocket Module

MEDIUM | JUNE 08, 2026 | CVE-2026-41838

Description

IDs for WebSocket sessions in the spring-websocket module are not cryptographically unpredictable, which may be possible to exploit in combination with inadequate authorization rules.

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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