CVE-2026-47356 Server-side request forgery in Terrascan
Unauthenticated attackers can force Terrascan server to send scan results to arbitrary URLs via SSRF in webhook configuration.
- 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-2026-47356?
CVE-2026-47356 is a high-severity 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 the webhook_url parameter in the file scan endpoint (POST /v1/{iac}/{iacVersion}/{cloud}/local/file/scan) when running in server mode. An unauthenticated remote attacker can supply an arbitrary URL as the webhook_url multipart form parameter. After scanning the uploaded file, Terrascan sends an HTTP POST request to the attacker-controlled URL containing the full scan results as a JSON body, with the attacker-supplied webhook_token forwarded as a Bearer token in the Authorization header. The retryable HTTP client retries up to 10 times on failure. 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-47356?
It affects 1 product.
Products include Tenable Terrascan.
How do I fix CVE-2026-47356?
No fix has been published for CVE-2026-47356 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-2026-47356 being exploited?
There is no known exploitation of CVE-2026-47356 in the wild and no public exploit code.
Other vulnerabilities in tenable Terrascan
Sources
Also known as GHSA-q2p7-5m6x-29x8.