What is CVE-2026-55486?

CVE-2026-55486 is a critical-severity vulnerability in Intranda Goobi-Viewer-Core, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-10-23.

How severe is CVE-2026-55486?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Intranda Goobi-Viewer-Core

CVE-2026-55486

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-23 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 >= 25.08, < 26.05

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-55486?: CVE-2026-55486 is a critical-severity vulnerability in Intranda Goobi-Viewer-Core, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-10-23.
How severe is CVE-2026-55486?: Critical severity. CVSS v3 base score is 9.3 out of 10.