Tenable Terrascan up to 1.18.3 Remote Directory Scan Endpoint remote_type remote_url server-side request forgery

Summaryinfo

A vulnerability was found in Tenable Terrascan up to 1.18.3. It has been classified as critical. The affected element is the function remote_type of the file /v1/{iac}/{iacVersion}/{cloud}/remote/dir/scan of the component Remote Directory Scan Endpoint. The manipulation of the argument remote_url leads to server-side request forgery. This vulnerability is listed as CVE-2026-47357. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Tenable Terrascan up to 1.18.3. It has been rated as critical. This issue affects the function remote_type of the file /v1/{iac}/{iacVersion}/{cloud}/remote/dir/scan of the component Remote Directory Scan Endpoint. The manipulation of the argument remote_url with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Terrascan v1.18.3 and prior are vulnerable to Server-Side Request Forgery (SSRF) via the remote_url parameter in the remote directory scan endpoint (POST /v1/{iac}/{iacVersion}/{cloud}/remote/dir/scan) when running in server mode. An unauthenticated remote attacker can supply an attacker-controlled HTTP URL as remote_url with remote_type set to "http". The URL is passed directly to hashicorp/go-getter (v1.7.5) without validation. Go-getter's HttpGetter supports the X-Terraform-Get response header, allowing the attacker's server to redirect the download to a file:// URL, enabling local file read. Additionally, HttpGetter has Netrc set to true, causing it to read ~/.netrc and send stored credentials to attacker-controlled hostnames. 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.

The weakness was presented by Tristan Madani. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-47357 since 05/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/23/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Tenable

Name

• Terrascan

Version

• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3

License

• free

CPE 2.3info

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CPE 2.2info

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