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Vulnerability record · CVE-2026-92760 · published 16 September 2026

CVE-2026-92760: Incorrect authorization vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.42% · top 66.8% CWE-863 · Incorrect authorization Deferred
7.1CVSS 4.0 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
23 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-92760), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.