CVE-2026-41839CWE-384

Spring Framework Escalation via Session Fixation in WebFlux

Medium · published June 9, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
11.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00213 · 11.0th percentile
Weakness
CWE-384 · Session Fixation
Published
2026-06-09T03:49Z
EPSS history
Timeline
  • 09 JUN 03:49Z
    Spring Framework Escalation via Session Fixation in WebFlux
    cvelistv5