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Vulnerabilities CVE-2026-18736

CVE-2026-18736

Medium
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
5.3
EPSS Score
0.24%

15.7th percentile

CVSS 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
Confidence
90%
Published
Aug 3, 2026
Last Modified
Aug 4, 2026
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