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LOW severity

OpenSearch has a bypass of REST Layer Authorization Using Malformed PathsGHSA-83x9-vc3c-hghc

LOW

GHSA-83x9-vc3c-hghc is a low-severity (CVSS 3.7) vulnerability in org.opensearch.plugin:opensearch-security. A fix is available for org.opensearch.plugin:opensearch-security — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of May 7, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
☕org.opensearch.plugin:opensearch-security

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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 Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.opensearch.plugin:opensearch-security≥ 2.11.0.0&&< 2.19.0.02.19.0.0org.opensearch.plugin:opensearch-security:2.19.0.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.opensearch.plugin:opensearch-security, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.opensearch.plugin:opensearch-security to 2.19.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-83x9-vc3c-hghc is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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 witho
O3 Security · Impact-Aware SCA

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OpenSearch has a bypass of REST Layer Authorization…