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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| shlinkio Shlink | 2.6.0 ≤ v ≤ 5.1.5 | — |
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