TI-2026-82264 Aliases CVE-2026-66091 GHSA-gj26-grcq-vm8j

Unauthenticated access to user details in openEQUELLA

LOW 37CWE-639Published 2026-10-29 · Updated 2026-10-29

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

openEQUELLA before 2026.1 exposes the GET /api/userquery/userinfobackup endpoint without any authentication or authorisation check. An unauthenticated remote attacker who supplies another user's uniqueId can retrieve that user's stored username, first name, last name and email address within the same institution. The flaw is an authorization bypass through a user-controlled key (CWE-639).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00403 34th percentileScored 2026-11-07

Fix Fixed openEQUELLA (Apereo Foundation): 2026.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apereo Foundation	openEQUELLA	2019.2 to before 2026.1	2026.1	Patch available	CNA

openEQUELLA VendorApereo Foundation Affected 2019.2 to before 2026.1 Fixed in 2026.1 Patch available CNA

Remediation

Upgrade openEQUELLA to version 2026.1 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA openEQUELLA (Apereo Foundation) Fixed in 2026.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-29
Apereo Foundation openEQUELLA 2026.1
5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2026-82261 OS command injection in openEQUELLA via system.executePriority MEDIUM 44
- TI-2026-82263 XML external entity injection in openEQUELLA allows file readsPriority LOW 31
- TI-2026-82262 XML external entity injection in openEQUELLA SOAP API lets attackers read filesPriority LOW 27
Show all 5 records →

Timeline

2026-10-29 Threatist record created from CVE-2026-66091
2026-10-29 CISA SSVC decision points changed
2026-10-29 Priority changed: MEDIUM → LOW
2026-10-29 Alias added: GHSA-gj26-grcq-vm8j

References

Advisory 1

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

Other 1

https://openequella.github.io/guides/

TI-2026-47769 openEQUELLA < 2026.1.0 Authenticated RCE via Java Deserialization in HTTP Invoker CVSS 4.0HIGH 8.7
TI-2026-82261 OS command injection in openEQUELLA via system.execute CVSS 4.0CRITICAL 9.4
TI-2026-82263 XML external entity injection in openEQUELLA allows file reads CVSS 4.0HIGH 7.1
TI-2026-82262 XML external entity injection in openEQUELLA SOAP API lets attackers read files CVSS 4.0MEDIUM 6.1
TI-2026-82265 Stored XSS in openEQUELLA pre-login notice via legacy logon page CVSS 4.0MEDIUM 4.8
TI-2026-82260 Stored XSS via pre-login notice image upload in openEQUELLA CVSS 4.0MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences