CRITICALCVSS v3.1 9.3Vulnerability

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.

Properties

Severity
CRITICAL
Nvd fetched at
2026-10-23T18:28:27.485228+00:00
Cvss severity
CRITICAL
Cvss score
9.3
Retrieved at
2026-10-23T18:30:16+00:00
Score
9.3
Cvss version
3.1
Last source
NVD
Cve id
CVE-2026-55486
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
First seen by Signal
2026-10-23T18:30:16+00:00
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Published at
2026-10-23T15:17:33.657
Last modified
2026-10-23T16:28:32.357

Related Entities (3)

HAS_WEAKNESS (3)

→[Weakness]Improper Neutralization of Special Elements Used in a Template Engine
→[Weakness]Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
→[Weakness]Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

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CVE-2026-55486 (CVSS v3.1 9.3) — Ninja Signal Threat Intelligence | Ninja Signal