Vulnerability · Published Jun 9, 2026 · Assigned by vmware
CVE-2026-41847Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL
Medium 4.8
In plain English
A medium-severity improper access control in Spring Framework from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.2%top 94.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libspring-java | no fix listed | DEBIAN-CVE-2026-41847 |
| Debian:13 | libspring-java | no fix listed | DEBIAN-CVE-2026-41847 |
| Debian:14 | libspring-java | no fix listed | DEBIAN-CVE-2026-41847 |
| Maven | org.springframework:spring-webflux | no fix listed | GHSA-vqgp-pf68-6947 |
| Ubuntu:25.10 | libspring-java | no fix listed | UBUNTU-CVE-2026-41847 |
| Ubuntu:26.04:LTS | libspring-java | no fix listed | UBUNTU-CVE-2026-41847 |
| Ubuntu:26.10 | libspring-java | no fix listed | UBUNTU-CVE-2026-41847 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Spring | Spring Framework | 5.3.0 – before 5.3.49 |
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N