Protection mechanism failure in Spring Framework - CVE-2026-41847
Published: August 31, 2026
Vulnerability identifier: #VU146407
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41847
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass security-related request handling.
The vulnerability exists due to improper implementation in the WebFlux Kotlin Router DSL when processing requests through a filter that passes a modified or replaced ServerRequest to the next handler function. A remote attacker can send a request to bypass security-related request handling.
The issue occurs only when a filter applies security-related concerns by modifying or replacing the ServerRequest, because the downstream handler receives the original unmodified request instead.
Affected software
Spring Framework
How to mitigate CVE-2026-41847
Install security update from vendor's website.
Spring Framework - update to 5.3.49