Quick answers
- Is CVE-2026-55459 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-55459 being exploited in the wild.
- How severe is CVE-2026-55459?
- High severity, with a CVSS score of 7.4, published 23 October 2026.
- Which products and versions are affected?
- Intranda Goobi viewer 25.01 to before 26.05.
- Is there a fix for CVE-2026-55459?
- Yes: fixed in 26.05. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-55459 attacked?
- It is in a web application.
- Am I affected by CVE-2026-55459?
- Check whether you run Intranda Goobi viewer 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: 26.05
Technical details
The AuthenticationEndpoint.verifyOpenIdToken method validates JWT tokens but does not enforce the aud (audience) claim during cryptographic validation; the aud check is performed manually afterwards using only string equality, which fails when the aud is an array rather than a string. In a multi-relying-party IdP setup, a token with a single-string aud matching the viewer's client ID but issued for a different relying party passes validation. This is a cryptographic validation bypass that allows account takeover without any user interaction beyond accessing the login endpoint.
Affected products
- intranda Goobi viewer 25.01 to before 26.05
Timeline
- 2026-10-23: disclosed
- 2026-06-11: patched: Version 26.05 released