Quick answers
- Is CVE-2026-66091 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66091 being exploited in the wild.
- How severe is CVE-2026-66091?
- Informational severity, published 29 October 2026.
- Which products and versions are affected?
- openEQUELLA before 2026.1.
- Is there a fix for CVE-2026-66091?
- Yes: fixed in 2026.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-66091 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-66091?
- Check whether you run openEQUELLA at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 2026.1
Technical details
The GET /api/userquery/userinfobackup endpoint in openEQUELLA fails to perform authentication or authorization checks, allowing an unauthenticated attacker to enumerate users and retrieve stored personal details by supplying another user's uniqueId. The vulnerability requires no special preconditions beyond network access to the API and knowledge of or ability to guess valid user IDs. This is a classic authorization bypass in a REST API endpoint.
Affected products
- openEQUELLA openEQUELLA before 2026.1