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CVE-2026-41838 Spring CVE debrief

CVE-2026-41838 is a medium severity vulnerability in the Spring Framework. The 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. This vulnerability affects Spring Framework versions 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48.

Vendor
Spring
Product
Spring Framework
CVSS
MEDIUM 4.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Developers and administrators using the Spring Framework should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability has a CVSS score of 4.8 and a CVSS severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N. The weakness is classified as CWE-330.

Defensive priority

Medium

Recommended defensive actions

  • Upgrade to a non-vulnerable version of the Spring Framework.
  • Implement adequate authorization rules to prevent exploitation.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. The vendor advisory can be found at [ref-4].

Official resources

CVE-2026-41838 was published on 2026-06-09T05:16:35.723Z and modified on 2026-06-11T16:53:41.830Z.