Input validation error in Spring Framework - CVE-2026-41853
Published: August 31, 2026
Vulnerability identifier: #VU146411
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41853
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass WAF or proxy checks.
The vulnerability exists due to improper input validation in multipart request handling in Spring MVC and Spring WebFlux when processing multipart requests. A remote attacker can send a malicious multipart request to bypass WAF or proxy checks.
Exploitation requires the application to accept multipart requests and to be protected by a WAF or proxy that parses multipart requests and performs checks based on their content.
Affected software
Spring Framework
How to mitigate CVE-2026-41853
Install security update from vendor's website.
Spring Framework - addressed in versions 5.3.49, 6.1.28, 6.2.18.1, 6.2.19, 7.0.7.1, 7.0.8