CVE-2026-66091

Medium

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.

SeverityMedium

CVSS6.9

Exploit probability—

ProductopenEQUELLA

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

Apereo Foundation openEQUELLA2026.1 or later

Vendor advisories

github.com/openequella/openEQUELLA/security/advisories/GHSA-mxj9-pmpw-j4xw

Affected products

Product	Affected versions	Fixed in
Apereo Foundation openEQUELLA	2019.2 ≤ v < 2026.1	2026.1

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