CVE-2026-76183
Description
A flaw was found in Apache Tomcat. This vulnerability, known as an 'Authentication Bypass by Alternate Name', allows an attacker to bypass the security restrictions set for WebSocket endpoints. This means that unauthorized users could gain access to protected resources or functionality, potentially leading to sensitive information disclosure or other unauthorized actions.
Statement
This vulnerability is rated as having an Important severity because unauthenticated remote attackers can circumvent access control constraints protecting WebSocket endpoints, posing significant risks to application data confidentiality and integrity. The issue specifically impacts Red Hat Enterprise Linux and JBoss Web Server environments where deployed applications configure container-managed security restrictions on WebSocket communication channels. Standard HTTP endpoints and applications that do not utilize WebSocket functionality remain unaffected by this vulnerability.
Mitigation
Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.4 | N/A | 9.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Frequently Asked Questions
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