CVE-2026-41839

Spring Framework Escalation via Session Fixation in WebFlux

State: Published
Severity: 4.2 Medium
Published: Jun 9, 2026
Updated: Jun 23, 2026
Reserved: Apr 22, 2026

Description

A WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authenticated user.

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.

Scores

CVSS	Score	Vector	Source
3.1	4.2 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N	vmware

Weaknesses

CWE-384 Session Fixation

Affected Products

Product	Versions
Spring FrameworkSpring	7.0.0 to before 7.0.7.1Affected 6.2.0 to before 6.2.18.1Affected 6.1.0 to before 6.1.28Affected 5.3.0 to before 5.3.49Affected

References

https://spring.io/security/cve-2026-41839

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