---
title: "CVE-2026-47892: Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints"
url: https://erroneo.us/security/cve/CVE-2026-47892/
description: "CVE-2026-47892 (org.springframework:spring-webflux (Maven)): A WebFlux application using functional endpoints and deployed with DispatcherServlet may be…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-27
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-47892"
kev: false
cvss: 9.8
epss: 0.00529
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-47892: Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 44: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 44% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.springframework:spring-webflux (Maven) >= 5.2.5.RELEASE, <= 5.2.25.RELEASE, no fixed version listed ; org.springframework:spring-webflux (Maven) >= 5.3.0, <= 5.3.49, no fixed version listed ; org.springframework:spring-webflux (Maven) >= 6.0.0, <= 6.0.30, no fixed version listed ; org.springframework:spring-webflux (Maven) >= 6.1.0, <= 6.1.28, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

A WebFlux application using functional endpoints and deployed with DispatcherServlet may be vulnerable to a header predicate bypass in a pre-flight request. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49 Spring Framework 5.2.5.RELEASE - 5.2.25.RELEASE

## Affected packages

- Maven `org.springframework:spring-webflux` >= 5.2.5.RELEASE, <= 5.2.25.RELEASE → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 5.3.0, <= 5.3.49 → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 6.0.0, <= 6.0.30 → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 6.1.0, <= 6.1.28 → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 6.2.0, <= 6.2.19 → fixed: none listed
- Maven `org.springframework:spring-webflux` >= 7.0.0, <= 7.0.8 → fixed: 7.0.9

## Affected products (CVE record)

- Spring Spring Framework: 7.0.0 <= 7.0.8, 6.2.0 <= 6.2.19, 6.1.0 <= 6.1.28, 6.0.0 <= 6.0.30, 5.3.0 <= 5.3.49, 5.2.5.RELEASE <= 5.2.25.RELEASE

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.53% probability of exploitation activity in the next 30 days; percentile 44.

## Sources

- [GitHub Advisory GHSA-9qf2-26p9-2q2q](https://github.com/advisories/GHSA-9qf2-26p9-2q2q)
- [CVE.org record CVE-2026-47892](https://www.cve.org/CVERecord?id=CVE-2026-47892)
- [NVD entry CVE-2026-47892](https://nvd.nist.gov/vuln/detail/CVE-2026-47892)
- [spring.io](https://spring.io/security/cve-2026-47892)

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Source page: https://erroneo.us/security/cve/CVE-2026-47892/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt