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Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints

Critical severity GitHub Reviewed Published Aug 27, 2026 to the GitHub Advisory Database • Updated Oct 7, 2026

Package

maven org.springframework:spring-webflux (Maven)

Affected versions

>= 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, <= 7.0.8

Patched versions

7.0.9

Description

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

References

Published by the National Vulnerability Database Aug 27, 2026
Published to the GitHub Advisory Database Aug 27, 2026
Reviewed Oct 7, 2026
Last updated Oct 7, 2026

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(45th percentile)

Weaknesses

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. Learn more on MITRE.

CVE ID

CVE-2026-47892

GHSA ID

GHSA-9qf2-26p9-2q2q

Source code

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