CVE-2026-41847: Spring Framework Spring Framework Security Filter Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-vqgp-pf68-6947
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CVSS 4.8
CWE-284
Published
Advisory Summary

CVE-2026-41847 is a MODERATE (CVSS 4.8) spring framework security filter bypass vulnerability (CWE-284: Improper Access Control) affecting Spring Framework libraries in the Maven ecosystem. The issue involves spring framework security filter bypass in webflux kotlin router dsl. Remediation is available in the latest vendor maintenance releases.

CVE-2026-41847 at a Glance

CVE Identifier CVE-2026-41847
GHSA Identifier GHSA-vqgp-pf68-6947
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-284: Improper Access Control
Affected Product Spring Framework
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-41847

To remediate this vulnerability, upgrade all affected Spring Framework dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.springframework:spring-webflux fixed: Latest secure release 
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webflux</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.springframework

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-41847, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.springframework

Analyze the terminal output to locate any version of Spring Framework in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.springframework command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Spring Framework, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Spring WebFlux applications may be vulnerable to a security bypass when using the Kotlin Router DSL. Affected versions: Spring Framework 5.3.0 through 5.3.48.

CVE-2026-41847 Affected Spring Framework Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.springframework:spring-webflux
maven/org.springframework/spring-webflux
Maven
≤ 5.3.39

References

NVD — CVE-2026-41847 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41847
Spring Framework Source Repository REPOSITORY
https://github.com/spring-projects/spring-framework
Spring Framework Security Information SECURITY
https://spring.io/security/cve-2026-41847

Frequently Asked Questions

What is CVE-2026-41847?
CVE-2026-41847 is a security vulnerability in Spring Framework involving Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL under CWE-284: Improper Access Control.
Which Spring Framework versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.springframework:spring-webflux.
What version fixes CVE-2026-41847?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is spring-webflux affected?
Yes, org.springframework:spring-webflux is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-41847?
CVE-2026-41847 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-41847?
CVE-2026-41847 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-41847?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.springframework'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vqgp-pf68-6947",
  "modified" : "2026-07-30T18:30:13Z",
  "published" : "2026-06-09T06:31:58Z",
  "aliases" : [ "CVE-2026-41847" ],
  "summary" : "Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL",
  "details" : "Spring WebFlux applications may be vulnerable to a security bypass when using the Kotlin Router DSL.\n\nAffected versions:\nSpring Framework 5.3.0 through 5.3.48.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.springframework:spring-webflux"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "5.3.39"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41847"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/spring-projects/spring-framework"
  }, {
    "type" : "WEB",
    "url" : "https://spring.io/security/cve-2026-41847"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-30T18:30:13Z",
    "nvd_published_at" : "2026-06-09T05:16:36Z"
  }
}