{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-45689: Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-45689","status":"final","version":"1","initial_release_date":"2026-06-24T20:57:32.281Z","current_release_date":"2026-06-24T20:57:32.281Z","revision_history":[{"date":"2026-06-24T20:57:32.281Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, an unauthenticated network attacker obtains a valid Rocket.Chat OAuth access token for an arbitrary user by sending a single HTTP POST with MongoDB query operators to /oauth/token. The Rocket.Chat OAuth2 server does not validate that grant parameters are strings before forwarding them to findOne({...}) against the oauth_apps and oauth_access_tokens collections, so an attacker substitutes {\"$ne\": null} for client_id, client_secret, and refresh_token and receives a freshly minted {access_token, refresh_token} pair bound to whichever user's refresh token Mongo returned first. The resulting access token is a first-class bearer credential against the full /api/v1/* surface as that user. By iterating with $nin / $regex operators the attacker walks the entire oauth_access_tokens collection, collecting one fresh access token per user per request. If any matched token belongs to an admin, the stolen bearer gives full admin API access (including Apps-Engine app installation, i.e. server-side code execution). No account, credentials, userId, or prior interaction with the instance are required. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-45689 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-45689"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-45689"},{"category":"external","summary":"https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-8p25-fm45-pjrw","url":"https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-8p25-fm45-pjrw"}]},"product_tree":{"branches":[{"category":"vendor","name":"RocketChat","branches":[{"category":"product_name","name":"Rocket.Chat","branches":[{"category":"product_version","name":">= 8.5.0-rc.0, < 8.5.0","product":{"name":"RocketChat Rocket.Chat >= 8.5.0-rc.0, < 8.5.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.4.0-rc.0, < 8.4.1","product":{"name":"RocketChat Rocket.Chat >= 8.4.0-rc.0, < 8.4.1","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.3.0-rc.0, < 8.3.3","product":{"name":"RocketChat Rocket.Chat >= 8.3.0-rc.0, < 8.3.3","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.2.0-rc.0, < 8.2.3","product":{"name":"RocketChat Rocket.Chat >= 8.2.0-rc.0, < 8.2.3","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.1.0-rc.0, < 8.1.4","product":{"name":"RocketChat Rocket.Chat >= 8.1.0-rc.0, < 8.1.4","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.0.0-rc.0, < 8.0.5","product":{"name":"RocketChat Rocket.Chat >= 8.0.0-rc.0, < 8.0.5","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 7.11.0-rc.0, < 7.13.7","product":{"name":"RocketChat Rocket.Chat >= 7.11.0-rc.0, < 7.13.7","product_id":"CSAFPID-7","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"< 7.10.11","product":{"name":"RocketChat Rocket.Chat < 7.10.11","product_id":"CSAFPID-8","product_identification_helper":{"cpe":"cpe:2.3:a:rocketchat:rocket.chat:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-45689","title":"Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User ATO","notes":[{"category":"description","text":"Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, an unauthenticated network attacker obtains a valid Rocket.Chat OAuth access token for an arbitrary user by sending a single HTTP POST with MongoDB query operators to /oauth/token. The Rocket.Chat OAuth2 server does not validate that grant parameters are strings before forwarding them to findOne({...}) against the oauth_apps and oauth_access_tokens collections, so an attacker substitutes {\"$ne\": null} for client_id, client_secret, and refresh_token and receives a freshly minted {access_token, refresh_token} pair bound to whichever user's refresh token Mongo returned first. The resulting access token is a first-class bearer credential against the full /api/v1/* surface as that user. By iterating with $nin / $regex operators the attacker walks the entire oauth_access_tokens collection, collecting one fresh access token per user per request. If any matched token belongs to an admin, the stolen bearer gives full admin API access (including Apps-Engine app installation, i.e. server-side code execution). No account, credentials, userId, or prior interaction with the instance are required. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6","CSAFPID-7","CSAFPID-8"]}]}]}