Is CVE-2026-18736 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18736?

CVE-2026-18736 has a CVSS v3 severity of MEDIUM (5).

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CVE-2026-18736

Description

Shlink contains a server-side request forgery vulnerability that allows authenticated API key holders to cause the server to issue arbitrary HTTP GET requests by supplying a crafted long URL during short URL creation with title auto-resolution enabled. Attackers can submit URLs pointing to public hosts that redirect to internal targets, including loopback addresses, link-local ranges, and cloud metadata endpoints such as 169.254.169.254, to exfiltrate internal service information via the HTML title element returned in the short URL creation response.