What’s Vulnerable › Vulnerabilities

CVE-2026-41847: Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-284

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 products

• Spring Framework: from 5.3.0 before 5.3.49 — fixed in 5.3.49
• Spring Framework: from 5.3.0 before 5.3.49 — fixed in 5.3.49

How to fix

Upgrade to a fixed version: Spring Framework 5.3.49; Spring Framework 5.3.49. Check the vendor advisory for mitigations.

References

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

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