CVE-2026-92760 Details
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.
A vulnerability exists in Shlink versions through 5.1.6, where the application fails to properly enforce API key role restrictions when issuing Mercure subscription tokens. This oversight allows restricted keys to subscribe to all topics, including those related to visit data from other users. Specifically, attackers holding author-only or domain-only keys can access the mercure-info endpoint, which provides real-time visit data such as referrer, user agent, geolocation, and full short URL objects for URLs outside their authorized access.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 16, 2026CISA-ADP
Assessed Sep 17, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/shlinkio/shlink/issues/2633 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/shlinkio/shlink | [email protected] | ProductVendor |
| https://github.com/shlinkio/shlink/blob/v5.1.6/module/Rest/src/Action/MercureInfoAction.php#L26-L42 | [email protected] | Source CodeVendor |
| https://github.com/shlinkio/shlink-common/blob/main/src/Mercure/LcobucciJwtProvider.php#L38-L41 | [email protected] | Source CodeVendor |
| https://github.com/shlinkio/shlink/issues/2633 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/shlink-through-5.1.6-mercure-token-authorization-bypass | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Shlink | <= 5.1.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 17, 2026 | CVE Modified | CISA-ADP |
| Sep 16, 2026 | New CVE Received | [email protected] |