{"schema":"threatline.record/2","record":{"id":"CVE-2026-55255","aliases":["GHSA-qrpv-q767-xqq2","PYSEC-2026-221"],"summary":"Langflow Authorization Bypass Through User-Controlled Key Vulnerability","details":"Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.","categories":["Applications & CMS"],"product":"Langflow","vendor":"Langflow","ecosystem":"PyPI","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-55255","source_modified_at":"2026-10-07T18:13:46.054Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"langflow","vendor":"langflow-ai","versions":[{"status":"affected","version":"< 1.9.1"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","source_modified_at":"2026-06-19T13:17:29Z","fetched_at":"2026-10-23T21:14:28.314422Z","package":{"ecosystem":"pip","name":"langflow"},"range":"< 1.9.1"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-qrpv-q767-xqq2","source_modified_at":"2026-07-07T22:30:08.905598564Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.9.1"}],"type":"ECOSYSTEM"}],"versions":["0.0.31","0.0.32","0.0.33","0.0.40","0.0.44","0.0.45","0.0.46","0.0.52","0.0.53","0.0.54","0.0.55","0.0.56","0.0.57","0.0.58","0.0.61","0.0.62","0.0.63","0.0.64","0.0.65","0.0.66","0.0.67","0.0.68","0.0.69","0.0.70","0.0.71","0.0.72","0.0.73","0.0.74","0.0.75","0.0.76","0.0.78","0.0.79","0.0.80","0.0.81","0.0.83","0.0.84","0.0.85","0.0.86","0.0.87","0.0.88","0.0.89","0.1.0","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.1.7","0.2.0","0.2.1"]}],"fixed_versions":[{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-qrpv-q767-xqq2","source_modified_at":"2026-07-07T22:30:08.905598564Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"ecosystem":"PyPI","name":"langflow","purl":"pkg:pypi/langflow"},"version":"1.9.1"}],"cvss":8.4,"severity":"High","kev":{"listed":true,"date_added":"2026-07-07","due_date":"2026-07-10","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","ransomware_campaign_use":"Unknown","forensic_triage":true},"epss":{"probability":0.00887,"percentile":0.58914,"score_date":"2026-10-23"},"published_at":"2026-06-23T16:28:20.985Z","modified_at":"2026-10-07T18:13:46.054Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-55255","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:13:46.054Z"},{"source":"GitHub Advisory Database","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","fetched_at":"2026-10-23T21:14:28.314422Z","source_modified_at":"2026-06-19T13:17:29Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-qrpv-q767-xqq2","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-07-07T22:30:08.905598564Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55255","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","GitHub Advisory Database","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","tags":["exploit"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55255","source":"CISA KEV"},{"source":"CVE List","url":"https://github.com/langflow-ai/langflow/pull/12832","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited","tags":["third-party-advisory"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2026-07-08T03:56:30.975870Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T18:13:46.054Z","content_hash":"81eb4efe091926ec357ac63964458c06fe364854c69b7df5182ea8e129c33f35"}}