Medium severity · published Jun 9, 2026
CVE-2026-41847
Spring Framework Security Filter Bypass in WebFlux Kotlin Router DSL
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Spring Framework · Spring
5.3.0 before 5.3.49 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41847
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41847
Vendor Advisory
https://spring.io/security/cve-2026-41847
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