CVE-2026-92760
Shlink through 5.1.6 Mercure Token Authorization Bypass
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
shlinkshlinkio |
|
References
- GitHub Issue #2633issue-tracking
- https://github.com/shlinkio/shlinkproduct
- MercureInfoAction issues a subscription token without reference to the API keytechnical-description
- buildSubscriptionToken emits the subscribe ['*'] claimtechnical-description
- VulnCheck Advisory: Shlink through 5.1.6 Mercure Token Authorization Bypassthird-party-advisory
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