CVE-2026-41839

MEDIUM

Spring Framework Escalation via Session Fixation in WebFlux

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 4.2

EPSS 0.0013

EPSS Percentile 3.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-384

Status published

Products (4)

Spring/Spring Framework 5.3.0 - 5.3.49

Spring/Spring Framework 6.1.0 - 6.1.28

Spring/Spring Framework 6.2.0 - 6.2.19

Spring/Spring Framework 7.0.0 - 7.0.8

Published Jun 09, 2026

Tracked Since Jun 09, 2026