Missing Authentication Step in Apache Tomcat Affects Multiple Versions

CVE-2026-55957

What is CVE-2026-55957?

CVE-2026-55957 is a vulnerability identified in Apache Tomcat, an open-source implementation of the Java Servlet, JavaServer Pages, and Java Expression Language technologies designed to provide a robust and scalable servlet container for web applications. The vulnerability arises from a missing critical step in its authentication process when the JNDIRealm is configured to authenticate binds using GSSAPI. This deficiency allows an attacker to authenticate without supplying the correct password, significantly undermining the security of applications relying on these authentication mechanisms. Given that Apache Tomcat is widely used to run Java applications, this vulnerability can lead to unauthorized access to sensitive data, application breaches, and compromised user accounts.

Potential impact of CVE-2026-55957

1. Unauthorized Access: Attackers can exploit this vulnerability to gain unauthorized access to systems and applications, leading to a potential data breach where sensitive information could be exposed or stolen.

2. Compromise of Application Integrity: Successful exploitation can allow attackers to manipulate or alter application behavior, potentially injecting malicious code or altering vital application processes, affecting the integrity of the application.

3. Increased Risk of Malware Deployment: With unauthorized access and control over systems, attackers may deploy malware or ransomware, leading to increased security incidents, network compromises, and operational disruptions within affected organizations.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

This is an advertDeploy the Patch →

References