Critical severity · published Oct 23, 2026
CVE-2026-55486
Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS
New
9.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GO
goobi-viewer-core · intranda
>= 25.08, < 26.05 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55486
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55486
github.com
https://github.com/intranda/goobi-viewer-core/commit/0e488c6b02a28c1d1a747dfe3958ad2bbcff2d0b
github.com
https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05
github.com
https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-975w-g9gj-xq48
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