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CVE-2026-18737— Shlink Blind SQL Injection via tags/stats orderBy Parameter

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 3.3.1版本至5.1.5版本存在SQL注入漏洞，该漏洞源于对tag statistics端点orderBy查询参数中的direction值验证不当，可能导致经过身份验证的API密钥持有者注入任意SQL片段，造成敏感数据泄露。

CVSS 6.5 · Medium EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
shlinkio Shlink 3.3.1≤ 5.1.5 affected
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I. Basic Information for CVE-2026-18737

Vulnerability Information
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Vulnerability Title
Shlink Blind SQL Injection via tags/stats orderBy Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Shlink contains a blind SQL injection vulnerability that allows any authenticated API key holder to inject arbitrary SQL fragments by supplying an unvalidated direction value in the orderBy query parameter of the tag statistics endpoint. Attackers can craft a malicious direction string containing SQL subqueries that flows unsanitized into a Doctrine QueryBuilder ORDER BY clause, enabling time-based, boolean-oracle, and error-based extraction of sensitive data including long URLs, visitor records, IP addresses, geolocation data, user agents, and hashed API key secrets from any tenant.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
shlinkio Shlink SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
shlinkio Shlink是shlinkio组织的一款URL缩短工具。 shlinkio Shlink 3.3.1版本至5.1.5版本存在SQL注入漏洞，该漏洞源于对tag statistics端点orderBy查询参数中的direction值验证不当，可能导致经过身份验证的API密钥持有者注入任意SQL片段，造成敏感数据泄露。
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 3.3.1 ~ 5.1.5 -

II. Public POCs for CVE-2026-18737

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III. Intelligence Information for CVE-2026-18737

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Vendor Advisories for CVE-2026-18737 (2)

Other References for CVE-2026-18737 (1)

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

CVE-2026-18736 5.0 MEDIUM Shlink Server-Side Request Forgery via Short URL Title Auto-Resolution
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-89

V. Comments for CVE-2026-18737

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