CVE-2026-55486 Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-55486?
CVE-2026-55486 is a critical vulnerability in intranda goobi-viewer-core, published on 23 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-55486?
How do I fix CVE-2026-55486?
No fix has been published for CVE-2026-55486 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55486 being exploited?
There is no known exploitation of CVE-2026-55486 in the wild and no public exploit code.
Sources
Also known as GHSA-975w-g9gj-xq48.