---
id: CVE-2026-55486
title: >-
  Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation
  and reflected XSS
summary: >-
  The Goobi viewer is a web application that allows digitised material to be
  displayed in a web browser. From version 25.08 to before version 26.05, the
  IIIF Auth 2.0 endpoints auth/login and auth/token in AuthorizationFlowResource
  accept …
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-79
  - CWE-113
  - CWE-1336
vendor: intranda
product: goobi-viewer-core
affected:
  - 'goobi-viewer-core >= 25.08, < 26.05'
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T14:17:42.732Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55486'
references:
  - url: >-
      https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-975w-g9gj-xq48
    label: >-
      https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-975w-g9gj-xq48
  - url: >-
      https://github.com/intranda/goobi-viewer-core/commit/0e488c6b02a28c1d1a747dfe3958ad2bbcff2d0b
    label: >-
      https://github.com/intranda/goobi-viewer-core/commit/0e488c6b02a28c1d1a747dfe3958ad2bbcff2d0b
  - 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: '2026-10-23T14:28:08.691Z'
---

## Overview

The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 25.08 to before version 26.05, the IIIF Auth 2.0 endpoints auth/login and auth/token in AuthorizationFlowResource accept an origin query parameter without validation and then (1) embed it into the Content-Security-Policy: frame-ancestors response header and (2) embed it into an HTML response body as a JavaScript single-quoted postMessage argument. Because the attacker controls both the login and token calls that initiate the flow, the unescaped value yields reflected XSS. This issue has been patched in version 26.05.

## Affected

- `goobi-viewer-core >= 25.08, < 26.05`

## Remediation

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