CVE-2026-41839 MEDIUM

CVE-2026-41839: Spring Framework Escalation via Session Fixation in WebFlux

Vendor Spring
Product Spring Framework
Weakness CWE-384 · Session fixation
Published June 9, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

4.2/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 9, 2026 Record updated