CVE-2026-66091 json
Unauthenticated IDOR Enables Disclosure of Other Users’ last-known details
published 14d ago modified 13d ago also EUVD-2026-112567 , GHSA-mxj9-pmpw-j4xw
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository openequella/openEQUELLA. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 6.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Apereo Foundation openEQUELLA 2026.1
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- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 14d ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | 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 |
| CNA | 4.0 | 6.9 | 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 |
Affected products
- Apereo Foundation openEQUELLA
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/openequella/openEQUELLA/security/advisories/GHSA-mxj9-pmpw-j4xw
vendor-advisory, advisory
-
openequella.github.io
/guides/
product
Sources
- CVE List CVE-2026-66091
- NVD CVE-2026-66091
- Maintainer advisory GHSA-mxj9-pmpw-j4xw
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of openequella/openEQUELLA published their own advisory on GitHub. Reviewed sources take precedence over it.