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CVE-2026-18736— Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution

Quick assessment

Affected
shlinkio Shlink
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

shlinkio Shlink是shlinkio组织的一款URL缩短工具。 shlinkio Shlink 2.6.0版本至5.1.5版本存在服务端请求伪造漏洞，该漏洞源于短URL创建时启用标题自动解析功能，未充分验证用户提供的URL，可能导致已认证的API密钥持有者通过提交特制长URL使服务器发出任意HTTP GET请求，并利用指向公共主机的URL重定向到内部目标（包括回环地址、链路本地范围和云元数据端点），通过HTML标题元素泄露内部服务信息。

CVSS 5.0 · Medium EPSS 0.30% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
shlinkio Shlink 2.6.0≤ 5.1.5 affected
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I. Basic Information for CVE-2026-18736

Vulnerability Information
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Vulnerability Title
Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
shlinkio Shlink 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
shlinkio Shlink是shlinkio组织的一款URL缩短工具。 shlinkio Shlink 2.6.0版本至5.1.5版本存在服务端请求伪造漏洞，该漏洞源于短URL创建时启用标题自动解析功能，未充分验证用户提供的URL，可能导致已认证的API密钥持有者通过提交特制长URL使服务器发出任意HTTP GET请求，并利用指向公共主机的URL重定向到内部目标（包括回环地址、链路本地范围和云元数据端点），通过HTML标题元素泄露内部服务信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
shlinkio Shlink 2.6.0 ~ 5.1.5 -

II. Public POCs for CVE-2026-18736

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III. Intelligence Information for CVE-2026-18736

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Vendor Advisories for CVE-2026-18736 (1)

Other References for CVE-2026-18736 (2)

Same Patch Batch · shlinkio · 2026-08-03 · 3 CVEs total

CVE-2026-18737 6.5 MEDIUM Shlink Blind SQL Injection via tags/stats orderBy Parameter
CVE-2026-18738 4.7 MEDIUM Shlink CSV Formula Injection via Visit Export CLI

IV. Related Vulnerabilities

Same product: Shlink
Same vendor: shlinkio
Same weakness: CWE-918

V. Comments for CVE-2026-18736

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