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Medium

Spring Framework Escalation via Session Fixation in WebFlux

  • Disclosed: 09.06.2026
  • Updated: 11.10.2026 13:20

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 software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.springframework:spring-webflux >= 7.0.0, < 7.0.8, >= 6.2.0, < 6.2.19, >= 6.1.0, <= 6.1.21, <= 5.3.39 7.0.8, 6.2.19

References

CVSS score 4.2/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE)
CWE-384
Platform
Java / Kotlin (Maven)
Package
org.springframework:spring-webflux
Disclosed
09.06.2026
Updated
11.10.2026 13:20

Sources and licenses

OSV / GitHub Advisory Database - GHSA-4hfh-6x8g-gwpp - CC BY 4.0

Vulnerability history: org.springframework:spring-webflux

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (20) in the archive
Total entries
20
First → latest
01.2020 08.2026
Without a fix
1
Exploited in attacks
1

Severity breakdown

  • Critical 3
  • High 4
  • Medium 11
  • Low 2

Disclosures per year

Severity:
  1. Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
    Critical · 9.8 CVE-2026-47892 >= 5.2.5.RELEASE, <= 5.2.25.RELEASE, >= 5.3.0, <= 5.3.49, >= 6.0.0, <= 6.0.30, >= 6.1.0, <= 6.1.28, >= 6.2.0, <= 6.2.19, >= 7.0.0, < 7.0.9 7.0.9
  2. Spring Framework Server Sent Event stream corruption while rendering fragments
    Critical · 9.8 CVE-2026-47890 >= 6.2.0, <= 6.2.19, >= 7.0.0, < 7.0.9 7.0.9
  3. Spring Framework Denial of Service via Versioned Resources in Spring MVC and WebFlux
    High · 7.5 CVE-2026-41842 >= 7.0.0, < 7.0.8, >= 6.2.0, < 6.2.19, >= 6.1.0, <= 6.1.21, <= 5.3.39 7.0.8, 6.2.19
  4. Spring Framework Escalation via Session Fixation in WebFlux this entry
    Medium · 4.2 CVE-2026-41839 >= 7.0.0, < 7.0.8, >= 6.2.0, < 6.2.19, >= 6.1.0, <= 6.1.21, <= 5.3.39 7.0.8, 6.2.19
  5. Spring Framework Path Traversal vulnerability
    High · 7.5 CVE-2024-38819 >= 6.1.0, < 6.1.14, <= 5.3.40, >= 6.0.0, <= 6.0.24 6.1.14
  6. Path traversal vulnerability in functional web frameworks
    High · 7.5 CVE-2024-38816 >= 6.1.0, < 6.1.13, >= 6.0.0, <= 6.0.23, >= 5.3.0, <= 5.3.39 6.1.13
  7. Remote Code Execution in Spring Framework
    Critical · 9.8 Exploited in attacks CVE-2022-22965 < 5.2.20.RELEASE, >= 5.3.0, < 5.3.18 5.2.20.RELEASE, 5.3.18
  8. RFD attack via Content-Disposition header sourced from request input by Spring MVC or Spring WebFlux Application
    High · 7.5 CVE-2020-5398 >= 5.2.0.RELEASE, < 5.2.3.RELEASE, >= 5.1.0.RELEASE, < 5.1.13.RELEASE, >= 5.0.0.RELEASE, < 5.0.16.RELEASE 5.2.3.RELEASE, 5.1.13.RELEASE, 5.0.16.RELEASE

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