What is CVE-2026-41847?

CVE-2026-41847 is a medium-severity vulnerability in Spring Framework, classified under Improper Access Control. CVSS score: 4.8/10. Published 2026-06-09.

How severe is CVE-2026-41847?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Spring Framework

CVE-2026-41847

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.

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Spring Framework — versions 5.3.0
VMware Spring Framework

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

spring.io/security/cve-2026-41847 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-41847?: CVE-2026-41847 is a medium-severity vulnerability in Spring Framework, classified under Improper Access Control. CVSS score: 4.8/10. Published 2026-06-09.
How severe is CVE-2026-41847?: Medium severity. CVSS v3 base score is 4.8 out of 10.