Auth bypass in Intranda Goobi-Viewer-Core
CVE-2026-55459
The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 25.01 to before version 26.05, AuthenticationEndpoint.verifyOpenIdToken builds its verifier as JWT.require(algorithm).withIssuer(issuer).build() and does not enforce the aud claim during cryptographic validation. The aud check is performed manually afterwards via a single string-equality call, which only handles single-string aud values. In a multi-RP IdP setup, a token whose single-string aud matches the viewer's client ID but was issued for a different relying party passes the check and authenticates the attacker as the token's sub. This issue has been patched in version 26.05.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Intranda Goobi-Viewer-Core — versions >= 25.01, < 26.05
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-55459?
- CVE-2026-55459 is a high-severity vulnerability in Intranda Goobi-Viewer-Core, classified under Improper Authentication. CVSS score: 7.4/10. Published 2026-10-23.
- How severe is CVE-2026-55459?
- High severity. CVSS v3 base score is 7.4 out of 10.