Improper access control in Spring Security - CVE-2026-59277
Published: August 31, 2026
Vulnerability identifier: #VU146380
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59277
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass a network-based access control check.
The vulnerability exists due to improper access control in InetAddressMatchers when classifying IP addresses with matchInternal() or matchExternal(). A remote attacker can use an address of 0.0.0.0 or :: to bypass a network-based access control check.
The issue affects applications that rely on this classification to treat 0.0.0.0 or :: as internal addresses.
Affected software
Spring Security
How to mitigate CVE-2026-59277
Install security update from vendor's website.
Spring Security - addressed in versions 7.1.0.1, 7.1.1