CVE-2026-41847

Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL

MEDIUM

5.3

CVSS Score

Published: June 9, 2026 at 03:51 AM UTC

Updated: July 23, 2026 at 07:32 PM UTC

2 products affected across 2 vendorsSpring FrameworkSpring Framework

Using Spring Framework by Spring?

Get instant alerts when new vulnerabilities affect Spring Framework - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Framework · VMware

95%

5.3.0 ≤ v < 5.3.49

Affected range stops below 5.3.49, so it looks safe — our inference, not a vendor statement

Spring Framework · Spring

60%

5.3.0 ≤ v < 5.3.495.3.0

Affected range stops below 5.3.49, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-41847

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-41847

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-284NVD-CWE-noinfo

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card