CVE-2026-18952 Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin
An authenticated attacker can exploit missing input validation in the threat intel parser to perform SSRF and read local files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18952?
CVE-2026-18952 is a high-severity server-side request forgery vulnerability in AWS Opensearch, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-18952?
How do I fix CVE-2026-18952?
No fix has been published for CVE-2026-18952 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-18952 being exploited?
There is no known exploitation of CVE-2026-18952 in the wild and no public exploit code.
Sources
Also known as GHSA-w946-8jxc-6v3m.