CVE-2026-92760

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/shlinkio/shlink
https://github.com/shlinkio/shlink-common/blob/main/src/Mercure/LcobucciJwtProvider.php#L38-L41
https://github.com/shlinkio/shlink/blob/v5.1.6/module/Rest/src/Action/MercureInfoAction.php#L26-L42
https://github.com/shlinkio/shlink/issues/2633
https://www.vulncheck.com/advisories/shlink-through-5.1.6-mercure-token-authorization-bypass
https://github.com/shlinkio/shlink/issues/2633

Configurations

No configuration.

History

17 Sep 2026, 16:18

Type	Values Removed	Values Added
References	~~() https://github.com/shlinkio/shlink/issues/2633 -~~	() https://github.com/shlinkio/shlink/issues/2633 -

16 Sep 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-16 21:17

Updated : 2026-09-17 16:18

NVD link : CVE-2026-92760

Mitre link : CVE-2026-92760

CVE.ORG link : CVE-2026-92760

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

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