CVE-2026-66091 PUBLISHED

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

Assigner: MON-CSIRT
Reserved: 24.07.2026 Published: 29.10.2026 Updated: 29.10.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Apereo Foundation
Product	openEQUELLA
Versions	Default: unaffected affected from 2019.2 to 2026.1 (excl.)

Solutions

Update to vendor recommended versions

Credits

dr0v3r finder

References

Problem Types

CWE-639 Authorization bypass through User-Controlled key CWE

Impacts

CAPEC-126 Path Traversal