---
id: CVE-2026-55459
title: 'Goobi viewer: OpenID JWT audience not enforced by the verifier'
summary: >-
  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).wit…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-287
  - CWE-345
vendor: intranda
product: goobi-viewer-core
affected:
  - 'goobi-viewer-core >= 25.01, < 26.05'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-23T14:54:28.105659Z'
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T14:57:39.675Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55459'
references:
  - url: >-
      https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-7vrv-qh6g-gfx7
    label: >-
      https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-7vrv-qh6g-gfx7
  - url: >-
      https://github.com/intranda/goobi-viewer-core/commit/73e2ccb63c36392d46f8d21644592efd6cf87933
    label: >-
      https://github.com/intranda/goobi-viewer-core/commit/73e2ccb63c36392d46f8d21644592efd6cf87933
  - url: 'https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05'
    label: 'https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05'
tags:
  - cve.org
ingestedAt: '2026-10-23T14:28:08.694Z'
---

## Overview

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.

## Affected

- `goobi-viewer-core >= 25.01, < 26.05`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.