CVE-2026-41838CWE-330

Spring Framework Predictable Session ID in WebSocket Module

Medium · published June 9, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
20.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00295 · 20.9th percentile
Weakness
CWE-330 · Use of Insufficiently Random Values
Published
2026-06-09T03:49Z
EPSS history
Timeline
  • 09 JUN 03:49Z
    Spring Framework Predictable Session ID in WebSocket Module
    cvelistv5