What’s Vulnerable › Vulnerabilities

CVE-2026-55486: Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-30
• Weakness: CWE-79

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.

Affected products

• intranda goobi-viewer-core: from 25.08, < 26.05

References

• https://github.com/intranda/goobi-viewer-core/commit/0e488c6b02a28c1d1a747dfe3958ad2bbcff2d0b
• https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05
• https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-975w-g9gj-xq48

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