Spring Framework Escalation via Session Fixation in WebFlux
Priority LOW 19CWE-384Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-384.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00213 11th percentileScored 2026-11-07
Fix Partial Spring Framework (Spring): 7.0.7.1, 6.2.18.1, 6.1.28 +1org.springframework:spring-webflux (Maven): 7.0.8, 6.2.19Red Hat: 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| VMware | Spring Framework | 7.0.0 to before 7.0.7.1; 6.2.0 to before 6.2.18.1; 6.1.0 to before 6.1.28; 5.3.0 to before 5.3.49 | 7.0.7.1, 6.2.18.1, 6.1.28, 5.3.49 | Patch available | CNA |
| — | org.springframework:spring-webflux (Maven) | 7.0.0 to before 7.0.8 | 7.0.8 | Patch available | GHSA-4hfh-6x8g-gwpp |
| — | org.springframework:spring-webflux (Maven) | 6.2.0 to before 6.2.19 | 6.2.19 | Patch available | GHSA-4hfh-6x8g-gwpp |
| — | org.springframework:spring-webflux (Maven) | 6.1.0 – 6.1.21 | — | No fix listed | GHSA-4hfh-6x8g-gwpp |
| — | org.springframework:spring-webflux (Maven) | up to 5.3.39 | — | No fix listed | GHSA-4hfh-6x8g-gwpp |
- Spring Framework VendorVMware Affected 7.0.0 to before 7.0.7.1; 6.2.0 to before 6.2.18.1; 6.1.0 to before 6.1.28; 5.3.0 to before 5.3.49 Fixed in 7.0.7.1, 6.2.18.1, 6.1.28, 5.3.49 Patch available CNA
- org.springframework:spring-webflux (Maven) Vendor— Affected 7.0.0 to before 7.0.8 Fixed in 7.0.8 Patch available GHSA-4hfh-6x8g-gwpp
- org.springframework:spring-webflux (Maven) Vendor— Affected 6.2.0 to before 6.2.19 Fixed in 6.2.19 Patch available GHSA-4hfh-6x8g-gwpp
- org.springframework:spring-webflux (Maven) Vendor— Affected 6.1.0 – 6.1.21 Fixed in — No fix listed GHSA-4hfh-6x8g-gwpp
- org.springframework:spring-webflux (Maven) Vendor— Affected up to 5.3.39 Fixed in — No fix listed GHSA-4hfh-6x8g-gwpp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:vmware:spring_framework:*:*:*:*:*:*:*:* | before 5.3.49; 6.1.0 to before 6.1.28; 6.2.0 to before 6.2.19; 7.0.0 to before 7.0.8 | Vulnerable | VMware |
- cpe:2.3:a:vmware:spring_framework:*:*:*:*:*:*:*:* Versions before 5.3.49; 6.1.0 to before 6.1.28; 6.2.0 to before 6.2.19; 7.0.0 to before 7.0.8 Vulnerable ·VMware
Remediation
- Fix · CNA Spring Framework (Spring) Fixed in 7.0.7.1, 6.2.18.1, 6.1.28, 5.3.49
- Fix · GHSA-4hfh-6x8g-gwpp org.springframework:spring-webflux (Maven) Fixed in 7.0.8 Advisory →
- Fix · GHSA-4hfh-6x8g-gwpp org.springframework:spring-webflux (Maven) Fixed in 6.2.19 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Spring Framework 5.3.49, 6.1.28 and 2 more versions
15 records Highest priority Priority MEDIUM 1 MEDIUM, 14 LOW
Other records, highest priority first
- TI-2026-30265 Spring Framework Unsafe Deserialization via Jackson JMS ConvertersPriority MEDIUM 43
- TI-2026-30261 Spring Framework Denial of Service via Unbounded Cache in SpELPriority LOW 39
- TI-2026-30260 Spring Framework Algorithmic Denial of Service via SpEL ExpressionsPriority LOW 39
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| OpenShift Developer Tools and Services | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-41839
- 2026-10-03 Alias added: GHSA-4hfh-6x8g-gwpp
References
Other 7
- https://github.com/spring-projects/spring-framework/issues/36742
- https://github.com/spring-projects/spring-framework/issues/36743
- https://github.com/spring-projects/spring-framework/commit/b8ddd2c690fe3f00bb5e3d9f913a37504aab49a0
- https://github.com/spring-projects/spring-framework/commit/d72da90d3a562632e2b565113813f7b4a31f8717
- https://github.com/spring-projects/spring-framework
- https://github.com/spring-projects/spring-framework/releases/tag/v6.2.19
- https://github.com/spring-projects/spring-framework/releases/tag/v7.0.8
More VMware Spring Framework vulnerabilities
- TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
- TI-2018-01175 Code injection in Spring Framework CVSS 3.1CRITICAL 9.8
- TI-2020-04444 RFD Attack via "Content-Disposition" Header Sourced from Request Input by Spring MVC or Spring WebFlux Application CVSS 3.1HIGH 7.5
- TI-2018-01180 Code injection in Spring Framework CVSS 3.1CRITICAL 9.8
- TI-2016-09283 Pivotal Spring Framework through 5.3.16 suffers from a potential remote code execution… CVSS 3.1CRITICAL 9.8
- TI-2014-00050 The Jaxb2RootElementHttpMessageConverter in Spring MVC in Spring Framework before 3.2.8… CVSS 2.0MEDIUM 6.8
Sources
- CVE-2026-41839 · CVE Program
- CVE-2026-41839 · NVD
- FIRST EPSS
- GHSA-4hfh-6x8g-gwpp · GitHub Advisory Database · CC BY 4.0
- CVE-2026-41839 · Red Hat security data · CC BY 4.0
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