CVE-2026-66091

MEDIUM 6.9CVE-2026-66091 · Published 29/10/2026 · updated 29/10/2026

In short

CVE-2026-66091 is a MEDIUM (CVSS 6.9) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.40%, higher than 34.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

openequella/openEQUELLA security advisory
openequella.github.io/guides

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free