{"id":"CVE-2026-105698","published":"2026-10-05T20:20:27Z","modified":"2026-10-06T13:58:36Z","title":"Langflow: Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints","vendor":"langflow-ai","product":"langflow","tier":"tail","description":{"text":"Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.0.0 until 1.10.1, Langflow did not verify flow ownership in the deprecated POST /api/v1/build/{flow_id}/vertices and POST /api/v1/build/{flow_id}/vertices/{vertex_id} handlers. Through version 1.7.1, an unauthenticated caller who knew another user's flow UUID could reach these handlers; from version 1.7.2 through 1.10.0, callers had to authenticate but needed no elevated privileges. Such a caller could cause retrieve_vertices_order to load and cache the private graph, enumerate its vertex identifiers, and use build_vertex to execute selected vertices and receive their results. build_graph_from_db_no_cache performed a primary-key lookup without an owner filter. This could disclose private flow structure, configured values, and selected outputs and could trigger victim-configured side effects and build-history records, although it did not expose the victim's variable-store credentials or permit modification of the stored flow. This issue is fixed in Langflow 1.10.1 and langflow-base 0.10.1.","provenance":"source","from":"CVE.org"},"cvss":{"score":5.4,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00225,"percentile":0.13223,"provenance":"source"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"},{"id":"CWE-862","name":"Missing Authorization"}],"references":[{"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-gh98-4phw-6fmw","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/langflow-ai/langflow/pull/13153","tags":["x_refsource_MISC"]},{"url":"https://github.com/langflow-ai/langflow/commit/fb3d6ec90b1e4d52eaa40915a64b1f86b6542f55","tags":["x_refsource_MISC"]},{"url":"https://github.com/langflow-ai/langflow/releases/tag/v1.10.1","tags":["x_refsource_MISC"]}],"priority":{"score":6.4,"factors":[{"name":"EPSS percentile","points":2.64},{"name":"CVSS severity","points":3.78}]},"vendorSlug":"langflow-ai","affectedVersions":[{"vendor":"langflow-ai","product":"langflow","versions":[">= 1.0.0, < 1.10.1"]},{"vendor":"langflow-ai","product":"langflow-base","versions":["< 0.10.1"]}],"affected":[{"ecosystem":"PyPI","package":"langflow","vulnerableRanges":[">=1.0.0, <1.10.1"],"patched":["1.10.1"],"from":["GHSA-gh98-4phw-6fmw","PYSEC-2026-4234"],"provenance":"source"},{"ecosystem":"PyPI","package":"langflow-base","vulnerableRanges":["<0.10.1"],"patched":["0.10.1"],"from":["GHSA-gh98-4phw-6fmw","PYSEC-2026-4238"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-92790","exploited":false,"provenance":"source"},"lineage":{"packageHistory":[{"cve":"CVE-2026-34046","published":"2026-03-27","fixed":"0.5.1","kev":false},{"cve":"CVE-2026-21445","published":"2026-01-02","fixed":"0.7.1","kev":false},{"cve":"CVE-2026-6596","published":"2026-04-20","fixed":"0.9.1","kev":false},{"cve":"CVE-2026-105698","published":"2026-10-05","fixed":"0.10.1","kev":false},{"cve":"CVE-2026-105697","published":"2026-10-05","fixed":"0.10.3","kev":false,"link":{"from":"CVE-2026-105698","to":"CVE-2026-105697","relation":"successor","confidence":"low","kind":"sequence","orderedBy":"description","evidence":[{"kind":"version-step","provenance":"source","package":"PyPI:langflow-base","fromFixed":"0.10.1","toFixed":"0.10.3","daysApart":0}]}}],"package":"PyPI:langflow-base"}}