{"id":"CVE-2026-114652","kind":"vulnerability","aliases":["CVE-2026-114652"],"related":[],"title":"MongoDB C# Driver: update builder lets user input alter stored data","description":"A data-query-logic neutralization weakness in the update-statement construction component of the MongoDB C# Driver can cause application-supplied values to be interpreted as query/update logic rather than as literal data. An application user who can influence the content of values that the application passes into the affected builder surface, without any special privilege beyond ordinary read-write application access, may cause stored data to be modified or removed in ways the application never intended. The result is unauthorized integrity impact on the affected application data; there is no direct loss of confidentiality or availability of the database service.","summary":"The MongoDB C# Driver's update-statement builder can treat application-supplied values as query or update logic instead of literal data. A user who can influence those values can modify or remove stored data the application did not intend to change.","severity":"high","cvss":7.1,"epss":0.00299,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["backend","csharp","dotnet","mongodb","package"],"not_affected_if":["no-user-input-in-updates","read-only-usage"],"how_to_check":"- Search the application for MongoDB C# Driver usage in project files, for example `dotnet list package | grep MongoDB.Driver`\n- Check the installed driver version with `dotnet list package` and compare it against the fixed version, which the sources do not name\n- Look for update builder calls that pass user-controlled values into update or filter definitions","fix":"- Upgrade the MongoDB.Driver NuGet package to the fixed release listed in the advisory (version unknown from the sources)\n- Until upgraded, validate or restrict user-supplied values before they reach update builder calls","status":"open","published_at":"2026-10-22T19:17:39+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","triaged_at":"2026-10-25T03:31:31+00:00","updated_at":"2026-10-25T03:31:31+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-10-25T03:31:31Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade the MongoDB.Driver NuGet package to the fixed release listed in the advisory (version unknown from the sources)\n- Until upgraded, validate or restrict user-supplied values before they reach update builder calls","reach":"internet","title":"MongoDB C# Driver: update builder lets user input alter stored data","impact":"medium","summary":"The MongoDB C# Driver's update-statement builder can treat application-supplied values as query or update logic instead of literal data. A user who can influence those values can modify or remove stored data the application did not intend to change.","category":"package","nicknames":[],"who_cares":["csharp","dotnet","mongodb","backend"],"confidence":0.5,"needs_auth":"yes","worst_case":"Attacker alters or deletes stored application data through update statements","analyst_note":"Find the fixed MongoDB.Driver version and the affected builder methods in the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-114652) or the MongoDB advisory.","how_to_check":"- Search the application for MongoDB C# Driver usage in project files, for example `dotnet list package | grep MongoDB.Driver`\n- Check the installed driver version with `dotnet list package` and compare it against the fixed version, which the sources do not name\n- Look for update builder calls that pass user-controlled values into update or filter definitions","needs_analyst":true,"not_affected_if":["no-user-input-in-updates","read-only-usage"],"who_is_affected":"Applications that use the MongoDB C# Driver and pass values influenced by application users into the update-statement builder can have stored data changed or removed. The sources do not say which builder methods are affected, so apps with no user-influenced update input are likely lower risk. Teams that only read data or use fixed update statements can likely skip it.","user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000671,"input_tokens":3426,"output_tokens":657,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-114652':14A,17A '-2026':13A,16A 'access':132C 'affect':119C,156C 'alter':9A 'applic':35B,61B,89C,104C,115C,131C,145C,157C 'application-suppli':34B,88C 'avail':167C 'backend':18B 'beyond':126C 'builder':5A,31B,120C 'c':2A,25B,84C 'caus':87C,134C 'chang':66B 'compon':80C 'confidenti':165C 'construct':79C 'content':110C 'csharp':19B 'cve':12A,15A 'data':11A,46B,59B,69C,102C,136C,158C 'data-query-log':68C 'databas':170C 'direct':162C 'dotnet':20B 'driver':3A,26B,85C 'impact':153C 'influenc':51B,108C 'input':8A 'instead':43B 'integr':152C 'intend':64B,147C 'interpret':94C 'let':6A 'liter':45B,101C 'logic':42B,71C,97C 'loss':163C 'may':133C 'modifi':55B,139C 'mongodb':1A,21B,24B,83C 'neutral':72C 'never':146C 'ordinari':127C 'packag':22B 'pass':116C 'privileg':125C 'queri':39B,70C 'query/update':96C 'rather':98C 'read':129C 'read-writ':128C 'remov':57B,141C 'result':149C 'servic':171C 'special':124C 'statement':30B,78C 'store':10A,58B,135C 'suppli':36B,90C 'surfac':121C 'treat':33B 'unauthor':151C 'updat':4A,29B,41B,77C 'update-stat':28B,76C 'user':7A,48B,105C 'valu':37B,53B,91C,112C 'way':143C 'weak':73C 'without':122C 'write':130C","nicknames":[],"mitigations":[],"who_affected":"Applications that use the MongoDB C# Driver and pass values influenced by application users into the update-statement builder can have stored data changed or removed. The sources do not say which builder methods are affected, so apps with no user-influenced update input are likely lower risk. Teams that only read data or use fixed update statements can likely skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T19:17:39+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"cna@mongodb.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-114652","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114652","severity":null,"published_at":"2026-10-22T19:17:39+00:00","modified_at":"2026-10-23T19:45:03+00:00","first_seen_at":"2026-10-23T21:57:31+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2026-114652","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114652","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-24T07:15:51+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"}