Answer in brief
CVE-2026-66091 records a Medium severity (CVSS 6.9) vulnerability in Unauthenticated IDOR Enables Disclosure of Other Users’ last-known details. The current sources do not mark it as known exploited. The current feed maps Apereo Foundation/openEQUELLA (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Apereo Foundation/openEQUELLA (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Apereo Foundation/openEQUELLAgeneric | >=2019.2 <2026.1 | 2026.1 |
Published upstream
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 29, 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.
Quoted source text, attributed separately from HOL analysis.