{"id":"CVE-2026-55255","aliases":["GHSA-qrpv-q767-xqq2","PYSEC-2026-221"],"url":"https://o3.security/vulnerability/CVE-2026-55255","summary":"Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow","details":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, 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 1.9.1.","published":"2026-06-23T16:28:20.985Z","modified":"2026-07-15T01:49:12.934019759Z","cvss":{"score":8.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L"},"epss":{"score":0.29052,"percentile":0.97981,"asOf":"2026-08-10"},"cisaKev":{"dateAdded":"2026-07-07","dueDate":"2026-07-10","knownRansomwareCampaignUse":false},"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"langflow","fixedVersion":"1.9.1"}],"fix":{"url":"https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e","label":"langflow-ai/langflow@2c9f498"},"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55255.json"},{"type":"ADVISORY","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55255"},{"type":"ADVISORY","url":"https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited"},{"type":"FIX","url":"https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e"},{"type":"FIX","url":"https://github.com/langflow-ai/langflow/pull/12832"}],"provenance":{"sources":["OSV.dev","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:12.934019759Z"}}