---
id: "CVE-2026-55442"
kind: "vulnerability"
aliases: ["CVE-2026-55442"]
title: "Goobi viewer: query sanitizer bypass lets attackers inject Solr local parameters"
severity: "medium"
cvss: 5.3
epss: 0.0045
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["goobi-viewer", "java", "package", "self-hosted", "solr"]
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-2026-55442", "first_seen_at": "2026-10-23T21:57:34+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-55442", "first_seen_at": "2026-10-25T12:38:49+00:00"}]
---

# Goobi viewer: query sanitizer bypass lets attackers inject Solr local parameters

Goobi viewer's cleanUpQuery sanitizer can be bypassed by wrapping Solr local parameters in doubled curly braces, so a valid local parameter reaches Solr. An attacker can use injected Solr parameters to alter or extend search queries against the backend index.

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

## How to check

- Check the Goobi viewer version in the deployment; versions from 23.03 up to but not including 26.05 are affected per the sources
- Look for the Goobi viewer application version in the deployed build or release tag, e.g. unknown if not exposed

## Fix

- Upgrade Goobi viewer to `26.05` or later, per the sources
- Unknown whether a configuration workaround exists before upgrading

## Timeline

- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-55442
- 2026-10-25T12:38:49+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-55442

## From the sources

The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 23.03 to before version 26.05, SolrTools.cleanUpQuery() strips Solr local-parameter syntax ({!...}) from user-supplied query strings before they reach Solr. Its regex can be bypassed by wrapping the local parameter in a second pair of curly braces ({{!...}}): the outer braces are stripped, the inner {!...} survives intact, and a valid Solr local parameter is forwarded. The flaw is in the shared sanitizer, so it affects any endpoint that routes user input through cleanUpQuery. The double-brace bypass applies from v23.10 (the greedy \{(.+)\} regex); a related bare-!join rewrap path is present. 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_