CVE-2026-41838 PUBLISHED

Spring Framework Predictable Session ID in WebSocket Module

Assigner: vmware
Reserved: 22.04.2026 Published: 09.06.2026 Updated: 09.06.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
CVSS Score: 4.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Spring
Product	Spring Framework
Versions	Default: unaffected affected from 7.0.0 to 7.0.8 (excl.) affected from 6.2.0 to 6.2.19 (excl.) affected from 6.1.0 to 6.1.28 (excl.) affected from 5.3.0 to 5.3.49 (excl.)

References

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

Problem Types

CWE-330: Use of Insufficiently Random Values CWE

Impacts

Predictable WebSocket session IDs in the spring-websocket module may allow an attacker to hijack sessions when combined with inadequate authorization rules, leading to unauthorized access.