Input validation error in Spring Authorization Server - CVE-2026-59355
Published: August 31, 2026
Vulnerability identifier: #VU146406
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59355
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to redirect users to an arbitrary website.
The vulnerability exists due to improper input validation in the authorization endpoint when processing a crafted authorization request containing an invalid request_uri and an arbitrary redirect_uri. A remote attacker can send a specially crafted authorization request to redirect users to an arbitrary website.
User interaction is required.
Affected software
Spring Authorization Server
How to mitigate CVE-2026-59355
Install security update from vendor's website.
Spring Authorization Server - addressed in versions 1.5.7.1, 1.5.8