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Advisory record · GHSA-4hfh-6x8g-gwpp

Spring Framework Escalation via Session Fixation in WebFlux

CVSS 4.2 MediumEPSS 0.0021 · 11th percentile

Published by the GitHub Advisory Database at 9 Jun 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.springframework:spring-webfluxMaven>=7.0.0, <7.0.8 || >=6.2.0, <6.2.19 || >=6.1.0, <=6.1.21 || <=5.3.397.0.8, 6.2.19
Identifiers
GHSA-4hfh-6x8g-gwpp · CVE-2026-41839
Weakness (CWE)
CWE-384
Tags
Published
9 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

spring-webflux versions 7.0.0 through 7.0.7 and 6.2.0 through 6.2.18 are affected, as are older 6.1.x and 5.3.x releases. An attacker who controls a compromised subdomain, for example via XSS, can exchange a known session ID for an authenticated user's session. Upgrade to 7.0.8 or 6.2.19; no fixed version is listed for 6.1.x or 5.3.x.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.2 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N CNA (vmware)
  • CISA KEV Not listed.
  • EPSS 0.0021, the 11th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.