OpenSearch has a bypass of REST Layer Authorization Using Malformed Paths
Description
A flaw was identified in the OpenSearch REST layer that could allow authorization checks to be bypassed when processing certain malformed HTTP requests. This could permit unauthorized access to restricted API endpoints in environments that rely on REST-layer authorization.
Transport-level authorization is not affected by this issue.
Impact
The default OpenSearch distribution is not affected by this issue. REST actions in the default distribution have corresponding transport actions that independently enforce authorization. Custom plugins that register REST actions without a corresponding transport action may be affected, potentially allowing unauthorized read access to those endpoints.
Patches
This issue is fixed in OpenSearch 2.19.0. Users should upgrade to 2.19.0 or later.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.opensearch.plugin:opensearch-security | >= 2.11.0.0, < 2.19.0.0 | 2.19.0.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-863- Platform
- Java / Kotlin (Maven)
- Package
org.opensearch.plugin:opensearch-security- Disclosed
- 07.05.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-83x9-vc3c-hghc - CC BY 4.0
Vulnerability history: org.opensearch.plugin:opensearch-security
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 08.2022 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 9
- Low 3
Disclosures per year
- 2022: 1
- 2023: 7
- 2024: 0
- 2025: 2
- 2026: 4
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OpenSearch has a bypass of REST Layer Authorization Using Malformed Paths this entry
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