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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-66091
StatePUBLISHED
AssignerMON-CSIRT
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 02:16:52 UTC
Updated2026-10-29 02:16:52 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from 9c1820ae-fb77-4810-a8aa-ca46e7474d2f

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/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:X/V:X/RE:X/U:X

Problem Types: CWE-639 | CWE-639 CWE-639 Authorization bypass through User-Controlled key

VersionSourceTypeScoreSeverityVector
4.09c1820ae-fb77-4810-a8aa-ca46e7474d2fSecondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS6.9MEDIUMCVSS: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 v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/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:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apereo Foundation OpenEQUELLA affected 2019.2 2026.1 custom Not specified

References

ReferenceSourceLinkTags
github.com/openequella/openEQUELLA/security/advisories/GHSA-mxj9-pmpw-j4xw 9c1820ae-fb77-4810-a8aa-ca46e7474d2f github.com
openequella.github.io/guides 9c1820ae-fb77-4810-a8aa-ca46e7474d2f openequella.github.io
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: dr0v3r (en)

Additional Advisory Data

Solutions

CNA: Update to vendor recommended versions

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