CVE-2026-47358 Server-side request forgery in Terrascan
Unauthenticated attackers can exploit SSRF in Terrascan server mode to read local files via uploaded IaC templates, requiring server mode deployment.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47358?
CVE-2026-47358 is a critical server-side request forgery vulnerability in tenable Terrascan, published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Terrascan v1.18.3 and prior are vulnerable to Server-Side Request Forgery (SSRF) via external URL resolution in uploaded IaC templates when running in server mode. When Terrascan parses uploaded ARM templates or CloudFormation templates, it resolves external URLs referenced within those templates via hashicorp/go-getter with all default detectors enabled, including FileDetector. An unauthenticated remote attacker can upload an ARM template containing a templateLink.uri or parametersLink.uri field, or a CloudFormation template containing an AWS::CloudFormation::Stack TemplateURL field, pointing to an attacker-controlled URL. Terrascan will fetch the attacker-controlled URL server-side. Unlike SSRF via the remote scan endpoint, file:// URLs are directly usable without requiring an X-Terraform-Get redirect, enabling local file read. This affects deployments running terrascan in server mode (terrascan server), which binds to 0.0.0.0 with no authentication. Note: Terrascan was archived in August 2023 and no patch will be released.
Which versions are affected by CVE-2026-47358?
It affects 1 product.
Products include Tenable Terrascan.
How do I fix CVE-2026-47358?
No fix has been published for CVE-2026-47358 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-2026-47358 being exploited?
There is no known exploitation of CVE-2026-47358 in the wild and no public exploit code.
Other vulnerabilities in tenable Terrascan
Sources
Also known as GHSA-8c33-whfw-95gh.