VULNERABILITY INTELLIGENCE
CVE-2026-18736
CVSS score5 MEDIUM
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-08-03
Last modified2026-10-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-918