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Vulnerability · Published Jun 9, 2026 · Assigned by vmware

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

Medium 4.2

In plain English

A medium-severity session fixation in Spring Framework from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.2%top 88.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libspring-javano fix listedDEBIAN-CVE-2026-41839
Debian:13libspring-javano fix listedDEBIAN-CVE-2026-41839
Debian:14libspring-javano fix listedDEBIAN-CVE-2026-41839
Mavenorg.springframework:spring-webfluxno fix listedGHSA-4hfh-6x8g-gwpp
Mavenorg.springframework:spring-webflux7.0.8GHSA-4hfh-6x8g-gwpp
Mavenorg.springframework:spring-webflux6.2.19GHSA-4hfh-6x8g-gwpp
Mavenorg.springframework:spring-webfluxno fix listedGHSA-4hfh-6x8g-gwpp
Ubuntu:25.10libspring-javano fix listedUBUNTU-CVE-2026-41839
Ubuntu:26.04:LTSlibspring-javano fix listedUBUNTU-CVE-2026-41839
Ubuntu:26.10libspring-javano fix listedUBUNTU-CVE-2026-41839

Affected products (as reported)

VendorProductVersions
Spring Spring Framework 7.0.0 – before 7.0.7.16.2.0 – before 6.2.18.16.1.0 – before 6.1.285.3.0 – before 5.3.49

Weakness: CWE-384 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References