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CVE-2026-92760— Shlink through 5.1.6 Mercure Token Authorization Bypass

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.

Shlink 5.1.6 之前的版本在颁发 Mercure 订阅令牌时，未能正确强制执行 API 密钥的角色限制，导致受限密钥能够订阅所有主题。拥有“仅作者”或“仅域名”权限的密钥的攻击者可以访问 端点，从而获取访问数据（包括来源页、用户代理、地理位置以及完整的短链接对象），即使这些短链接超出了其授权范围。

CVSS 6.5 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 1

VendorProduct Version RangeStatus
shlinkio shlink ≤ 5.1.6 affected
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I. Basic Information for CVE-2026-92760

Vulnerability Information
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Vulnerability Title
Shlink through 5.1.6 Mercure Token Authorization Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Shlink through 5.1.6 fails to enforce API key role restrictions when issuing Mercure subscription tokens, allowing restricted keys to subscribe to all topics. Attackers with author-only or domain-only keys can access the mercure-info endpoint to receive visit data including referrer, user agent, geolocation, and full short URL objects for URLs outside their authorization boundary.
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
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
shlinkio shlink 0 ~ 5.1.6 -

II. Public POCs for CVE-2026-92760

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III. Intelligence Information for CVE-2026-92760

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Vendor Advisories for CVE-2026-92760 (1)

Other References for CVE-2026-92760 (4)

IV. Related Vulnerabilities

Same product: shlink
Same vendor: shlinkio
Same weakness: CWE-863

V. Comments for CVE-2026-92760

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