---
id: "CVE-2026-55463"
kind: "vulnerability"
aliases: ["CVE-2026-55463"]
title: "Goobi viewer: WebSocket endpoints accept unauthenticated connections, letting attackers disrupt reviewers"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["goobi-viewer", "java", "runtime", "self-hosted", "websocket"]
not_affected_if: ["version-outside-range"]
published_at: "2026-10-23T15:17:33+00:00"
first_seen_at: "2026-10-23T21:57:34+00:00"
updated_at: "2026-10-25T03:47:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55463", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Goobi viewer: WebSocket endpoints accept unauthenticated connections, letting attackers disrupt reviewers

Several Jakarta WebSocket endpoints in goobi-viewer-core accept connections without checking that the session belongs to a logged-in user, and they do not validate the Origin header. An unauthenticated attacker can pollute the crowdsourcing page-lock map and broadcast forged lock messages, disrupting reviewers' work.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed goobi-viewer-core or Goobi viewer version; versions from `4.11.0` up to but not including `26.05` are affected.
- Confirm whether the crowdsourcing (campaign) feature is in use, since CampaignEndpoint is the path that lets attackers forge lock messages.

## Fix

- Upgrade Goobi viewer to `26.05` or later.

## Timeline

- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-55463

## From the sources

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.

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