Spring Framework Predictable Session ID in WebSocket Module
CVE-2026-41838

4.8MEDIUM

Key Information:

Vendor

Spring

Status
Spring Framework
Vendor
CVE Published:
9 June 2026

What is CVE-2026-41838?

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 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.

Affected Version(s)

Spring Framework 7.0.0 < 7.0.8

Spring Framework 6.2.0 < 6.2.19

Spring Framework 6.1.0 < 6.1.28

References

https://spring.io/security/cve-2026-41838

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.