CVE-2026-55486: The Goobi viewer is a web application that allows digitised material to be displayed in a web browser

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CRITICAL 9.3

CVE-2026-55486 is a critical-severity flaw (CVSS 9.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 postMe

Why this priority

Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-79, CWE-113, CWE-1336
Published	2026-10-23
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc.

Timeline

2026-10-23 15:17 UTCPublished CVE record published
2026-10-23 16:28 UTCUpdated Record last modified

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References

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