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Advisories

Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution

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severity
medium
date
Affecting

  • Shlink >= 2.6.0, <= 5.1.5

CWE
  • CWE-918 Server-Side Request Forgery (SSRF)
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Credit
Theodosis Paidakis
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.

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