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Spring Framework Escalation via Session Fixation in WebFlux

Spring Framework · CVE-2026-41839
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
4.2
EPSS
0.2%
First seen
7 d ago
Status
corroborated

All Spring vulnerabilities