CVE-2026-18736

Summary

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.

Affected Software

Weaknesses

• CWE-918: Server-Side Request Forgery (SSRF)

References

• https://github.com/theopaid/Server-side-request-forgery-through-short-URL-title-resolution-shlink-
• https://github.com/shlinkio/shlink
• https://www.vulncheck.com/advisories/shlink-server-side-request-forgery-via-short-url-title-auto-resolution

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