Bug 2538012 (CVE-2026-68493)

Summary: CVE-2026-68493 Nextcloud: Nextcloud: Information disclosure via identifier guessing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Nextcloud. A malicious logged-in user could potentially guess a highly complex unique identifier. This guessing could allow the user to retrieve a list of memberships for a circle they are not authorized to access, leading to information disclosure.
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Description OSIDB Bzimport 2026-09-22 16:34:34 UTC
After guessing a 62^15 complex unique identifier, a malicious logged in user was able to retrieve a list of memberships for a circle they are not a member of.