Answer in brief
CVE-2026-41839 records a Medium severity (CVSS 4.2) vulnerability in Spring Framework Escalation via Session Fixation in WebFlux. The current sources do not mark it as known exploited. The current feed maps org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven), org.springframework:spring-webflux (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| org.springframework:spring-webfluxmaven | >=6.1.0,<=6.1.21 | Not reported |
| org.springframework:spring-webfluxmaven | <=5.3.39 | Not reported |
| org.springframework:spring-webfluxmaven | >=6.2.0,<=6.2.18 | 6.2.19 |
| org.springframework:spring-webfluxmaven | >=7.0.0,<=7.0.7 | 7.0.8 |
| org.springframework:spring-webfluxmaven | >=7.0.0 <7.0.8 | 7.0.8 |
| org.springframework:spring-webfluxmaven | >=6.2.0 <6.2.19 | 6.2.19 |
| org.springframework:spring-webfluxmaven | >=6.1.0 | Not reported |
| org.springframework:spring-webfluxmaven | >=0 | Not reported |
Published upstream
Jun 9, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.