CVE-2026-66091

Unauthenticated IDOR Enables Disclosure of Other Users’ last-known details

Published Oct 29, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
In openEQUELLA before 2026.1, the GET /api/userquery/userinfobackup endpoint performs no authentication or authorisation check. An unauthenticated attacker who supplies another user's uniqueId can retrieve that user's stored personal details (username, first name, last name and email address) within the same institution.

Remediation

Vendor Solution

Update to vendor recommended versions

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Apereo Foundation
Apereo Foundation openequella
Vendors & Products Apereo Foundation
Apereo Foundation openequella
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description In openEQUELLA before 2026.1, the GET /api/userquery/userinfobackup endpoint performs no authentication or authorisation check. An unauthenticated attacker who supplies another user's uniqueId can retrieve that user's stored personal details (username, first name, last name and email address) within the same institution.
Title Unauthenticated IDOR Enables Disclosure of Other Users’ last-known details
Weaknesses CWE-639
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
MON-CSIRT
Published
Updated
Oct 29, 2026, 2:02 AM
Reserved
Jul 24, 2026, 2:22 AM
Status
Deferred
Published
Oct 29, 2026, 2:16 AM
Modified
Oct 29, 2026, 3:56 PM