CVE-2026-55486GHSA-975w-g9gj-xq48

goobi-viewer-core: Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS

intranda goobi-viewer-core

Open in Threatline Record JSON

CVSS

9.3Critical

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet

Fixed inNone listedNo source names a fixed version. Check the vendor advisory below

Published23 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

@stackflag.bsky.social: CVE-2026-55486 - goobi-viewer-core Versions of Goobi Viewer from 25.08 up to 26.04 accept an unchecked "origin" value in its login and token URLs. An attacker can supply a crafted Bluesky: CVE posts, 23 Oct 2026

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.

Text from CVE List

Affected versions 1

goobi-viewer-coreaffected: >= 25.08, < 26.05CVE List