CVE-2026-55463: Goobi viewer: WebSocket endpoints lack server-side authentication and origin validation

Vulnerability summary

CVE-2026-55463 is a medium (CVSS 6.5) vulnerability in intranda goobi-viewer-core.

Timeline

1. 23-10-2026
   PublishedVulnerability first disclosed.

Description

The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 4.11.0 to before version 26.05, several Jakarta WebSocket endpoints in goobi-viewer-core (DownloadTaskEndpoint, CampaignEndpoint, AutocompleteEndpoint, UserEndpoint) accept connections without verifying that the associated HttpSession belongs to a logged-in user, and none validate the Origin header against an allowlist. An unauthenticated attacker can therefore connect to these endpoints; through CampaignEndpoint this allows polluting the in-process crowdsourcing page-lock map and broadcasting forged lock messages, disrupting reviewers' work. This issue has been patched in version 26.05.

• CWE-306Missing Authentication for Critical FunctionThe product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
• CWE-862Missing AuthorizationThe product does not perform an authorization check when an actor attempts to access a resource or perform an action.
• CWE-1385Missing Origin Validation in WebSocketsThe product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.