---
id: "CVE-2026-55444"
kind: "vulnerability"
aliases: ["CVE-2026-55444"]
title: "Goobi viewer: unauthenticated RSS feed exposes access-restricted records"
severity: "medium"
cvss: 5.3
epss: 0.00435
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["digital-libraries", "goobi-viewer", "package", "self-hosted"]
not_affected_if: ["version-26.05-or-later"]
published_at: "2026-10-23T15:17:32+00:00"
first_seen_at: "2026-10-23T21:57:34+00:00"
updated_at: "2026-10-25T12:38:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55444", "first_seen_at": "2026-10-23T21:57:34+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-55444", "first_seen_at": "2026-10-25T12:38:49+00:00"}]
---

# Goobi viewer: unauthenticated RSS feed exposes access-restricted records

The legacy RSS servlet in Goobi viewer passes the q and filterQuery parameters into Solr queries without validation. An unauthenticated attacker can inject Solr boolean operators to drop the access-condition filter, so restricted records appear in the generated RSS feed.

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

## How to check

- Check the installed Goobi viewer version; versions before `26.05` are affected.
- Request `GET /rss/` on the viewer and see whether the feed includes records that are access-restricted for anonymous users.

## 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-2026-55444
- 2026-10-25T12:38:49+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-55444

## From the sources

The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. Prior to version 26.05, the legacy RSS servlet (RssResolver, GET /rss/) accepts the q and filterQuery parameters and concatenates them into Solr queries without validation. The servlet predates the REST API layer and lacks the input validation present in GET /api/v1/records/rss. q forms the main query body (wrapped only in literal parentheses); filterQuery is passed directly as a Solr fq. An unauthenticated attacker can inject Solr boolean operators to break out of the wrapping and render the trailing access-condition filter-query suffix optional, so that access-restricted records are included in the generated RSS feed. The q and filterQuery parameters are the same underlying vulnerability in the same servlet; q (the main query body) has the broader scope. This issue has been patched in version 26.05.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_