{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-55255: Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-55255","status":"final","version":"1","initial_release_date":"2026-06-23T16:28:20.985Z","current_release_date":"2026-06-23T17:32:52.375Z","revision_history":[{"date":"2026-06-23T16:28:20.985Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.2.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-55255 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-55255"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-55255"},{"category":"external","summary":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2"},{"category":"external","summary":"https://github.com/langflow-ai/langflow/pull/12832","url":"https://github.com/langflow-ai/langflow/pull/12832"}]},"product_tree":{"branches":[{"category":"vendor","name":"langflow-ai","branches":[{"category":"product_name","name":"langflow","branches":[{"category":"product_version","name":"< 1.9.2","product":{"name":"langflow-ai langflow < 1.9.2","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:langflow-ai:langflow:\\<_1.9.2:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-55255","title":"Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow","notes":[{"category":"description","text":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.2.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L","baseScore":9.9,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}