---
id: CVE-2026-92760
title: >-
  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
summary: >-
  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 end…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-863
vendor: shlinkio
product: shlink
affected:
  - shlink <= 5.1.6
published: '2026-09-16'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:48.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92760'
references:
  - url: 'https://github.com/shlinkio/shlink'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/shlinkio/shlink-common/blob/main/src/Mercure/LcobucciJwtProvider.php#L38-L41
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/shlinkio/shlink/blob/v5.1.6/module/Rest/src/Action/MercureInfoAction.php#L26-L42
    label: disclosure@vulncheck.com
  - url: 'https://github.com/shlinkio/shlink/issues/2633'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/shlink-through-5.1.6-mercure-token-authorization-bypass
    label: disclosure@vulncheck.com
  - url: 'https://github.com/shlinkio/shlink/issues/2633'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00415
epssPercentile: 0.33137
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T15:00:49.023740Z'
ingestedAt: '2026-09-16T21:05:36.896Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.