ES FLS Bypass: Auth User Reads Excluded Const_Keyword
CVE-2026-115298 Published on November 3, 2026
Incorrect Authorization in Elasticsearch Leading to Information Disclosure
Incorrect Authorization (CWE-863) in Elasticsearch can lead to information disclosure via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). An authenticated user whose index access is restricted by field-level security can retrieve the value of a constant_keyword field that their role excludes. Some search and query features do not apply the field-level security restriction to this field type.
Vulnerability Analysis
CVE-2026-115298 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-115298 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-115298
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Affected Versions
Elasticsearch:- Version 8.0.0, <= 8.19.23 is affected.
- Version 9.0.0, <= 9.4.8 is affected.
- Version 9.5.0, <= 9.5.5 is affected.