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🛡️ CVE-2026-41847 — spring-framework

🟡 CVSS 4.8 — Medium ✅ No Known Exploit CWE-284 NVD
4.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Weakness class

CVE-2026-41847 is classified as CWE-284: Improper Access Control. The software does not restrict an action to the actors that should be allowed to perform it.

Affected software

CVE-2026-41847 is recorded against 2 packages.

  • org.springframework:spring-webflux
  • spring-framework (from 5.3.0 up to 5.3.49)

Timeline and source

Published on 9 June 2026 and last revised on 30 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Package)
spring.io (Web)

Other advisories for this package

org.springframework:spring-webflux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-284: Improper Access Control) in other software:

CVE-2026-41847 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 4.8
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-284
Public Exploit ✅ No
Source NVD
Published 2026-06-09
Updated 2026-08-20
Modified 2026-07-30
Fix URL N/A

Affected Packages

Software From version Fixed in
org.springframework:spring-webflux — —
spring-framework 5.3.0 5.3.49

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