{"id":"CVE-2026-55444","kind":"vulnerability","aliases":["CVE-2026-55444"],"related":[],"title":"Goobi viewer: unauthenticated RSS feed exposes access-restricted records","description":"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.","summary":"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.","severity":"medium","cvss":5.3,"epss":0.00435,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["digital-libraries","goobi-viewer","package","self-hosted"],"not_affected_if":["version-26.05-or-later"],"how_to_check":"- Check the installed Goobi viewer version; versions before `26.05` are affected.\n- 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.","status":"open","published_at":"2026-10-23T15:17:32+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","triaged_at":"2026-10-25T04:18:51+00:00","updated_at":"2026-10-25T12:38:49+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:18:51Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Goobi viewer to `26.05` or later.","reach":"internet","title":"Goobi viewer: unauthenticated RSS feed exposes access-restricted records","impact":"low","summary":"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.","category":"package","nicknames":[],"who_cares":["goobi-viewer","self-hosted","digital-libraries"],"confidence":0.7,"needs_auth":"no","worst_case":"Anonymous users read metadata of access-restricted records via the RSS feed.","analyst_note":"","how_to_check":"- Check the installed Goobi viewer version; versions before `26.05` are affected.\n- Request `GET /rss/` on the viewer and see whether the feed includes records that are access-restricted for anonymous users.","needs_analyst":false,"not_affected_if":["version-26.05-or-later"],"who_is_affected":"Deployments of Goobi viewer before 26.05 that expose the legacy /rss/ servlet to anonymous visitors and hold records with access restrictions. The sources do not describe a non-default configuration, so the default setup appears to be exposed. Installations already on 26.05 or later are not affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00061,"input_tokens":3504,"output_tokens":519,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-55444':13A,16A '/api/v1/records/rss':127C '/rss':97C '26.05':90C,216C 'accept':98C 'access':8A,57B,166C,176C 'access-condit':56B,165C 'access-restrict':7A,175C 'allow':77C 'api':117C 'appear':63B 'applic':75C 'attack':47B,149C 'bodi':133C,204C 'boolean':51B,153C 'break':156C 'broader':207C 'browser':86C 'concaten':105C 'condit':58B,167C 'cve':11A,14A 'digit':18B 'digital-librari':17B 'digitis':78C 'direct':142C 'display':82C 'drop':54B 'expos':6A 'feed':5A,68B,185C 'filter':59B,169C 'filter-queri':168C 'filterqueri':38B,102C,139C,189C 'form':129C 'fq':146C 'generat':66B,183C 'get':96C,126C 'goobi':1A,21B,32B,70C 'goobi-view':20B 'host':26B 'includ':180C 'inject':49B,151C 'input':122C 'issu':210C 'lack':120C 'layer':118C 'legaci':28B,92C 'librari':19B 'liter':137C 'main':131C,202C 'materi':79C 'oper':52B,154C 'option':172C 'packag':23B 'paramet':39B,103C,190C 'parenthes':138C 'pass':34B,141C 'patch':213C 'predat':114C 'present':124C 'prior':87C 'q':36B,100C,128C,187C,200C 'queri':42B,109C,132C,170C,203C 'record':10A,62B,178C 'render':162C 'rest':116C 'restrict':9A,61B,177C 'rss':4A,29B,67B,93C,184C 'rssresolv':95C 'scope':208C 'self':25B 'self-host':24B 'servlet':30B,94C,113C,199C 'solr':41B,50B,108C,145C,152C 'suffix':171C 'trail':164C 'unauthent':3A,46B,148C 'under':194C 'valid':44B,111C,123C 'version':89C,215C 'viewer':2A,22B,33B,71C 'vulner':195C 'web':74C,85C 'without':43B,110C 'wrap':134C,160C","nicknames":[],"mitigations":[],"who_affected":"Deployments of Goobi viewer before 26.05 that expose the legacy /rss/ servlet to anonymous visitors and hold records with access restrictions. The sources do not describe a non-default configuration, so the default setup appears to be exposed. Installations already on 26.05 or later are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-23T15:17:32+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-55444","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55444","severity":null,"published_at":"2026-10-23T15:17:32+00:00","modified_at":"2026-10-23T16:28:32+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"epss","external_id":"CVE-2026-55444","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55444","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-25T12:38:49+00:00","fetched_at":"2026-10-25T12:38:49+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}