CVE-2026-41839 Security Details

CVE ID

CVE-2026-41839

CWE

CWE-384

CVE 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.

Published

Jun 8, 2026

CVSS Score & Severity

2.3Low

CVSS Vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS Score

0.027%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/springframework/web/server/session/InMemoryWebSessionStore$InMemoryWebSession.changeSessionId()Lreactor/core/publisher/Mono;

JVM

Affected Ecosystems

affected

Source

National Vulnerability Database

References

spring.ioPROJECT