Vulnerability Description
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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/intranda/goobi-viewer-core/commit/0e488c6b02a28c1d1a747dfe395
- https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05
- https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-975w-g9gj
FAQ
What is CVE-2026-55486?
CVE-2026-55486 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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...
How severe is CVE-2026-55486?
CVE-2026-55486 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55486?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.