{"id":"CVE-2026-55255","title":"Langflow is a tool for building and deploying AI-powered agents and workflows","summary":"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 be…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L","cwe":["CWE-639"],"vendor":"langflow","product":"langflow","affected":["langflow < 1.9.1"],"patched":["langflow 1.9.1"],"published":"2026-06-23","updated":"2026-10-07","sourceUpdated":"2026-10-07T19:17:38.593","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55255","references":[{"url":"https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e","label":"security-advisories@github.com"},{"url":"https://github.com/langflow-ai/langflow/pull/12832","label":"security-advisories@github.com"},{"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","label":"security-advisories@github.com"},{"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-qrpv-q767-xqq2"}],"tags":["nvd","kev","in-the-wild","exploit-available","cve.org","ghsa","pip"],"epss":0.00887,"epssPercentile":0.59091,"kev":true,"kevDateAdded":"2026-07-07","kevDueDate":"2026-07-10","kevRansomware":false,"exploited":true,"exploits":{"github":1,"githubRepos":["https://github.com/rootdirective-sec/CVE-2026-55255-Lab"],"checkedAt":"2026-10-27T19:04:03.552Z"},"exploitAvailable":true,"ecosystem":"pip","ssvc":{"exploitation":"active","automatable":"no","technicalImpact":"total","timestamp":"2026-07-08T03:56:30.975870Z"},"scores":{"nvd":8.4,"cna":8.4,"ghsa":9.9},"ingestedAt":"2026-06-22T13:35:24.306Z","slug":"CVE-2026-55255","body":"## Overview\n\nLangflow 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.\n\n## Affected\n\n- `langflow < 1.9.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `langflow 1.9.1`\n\n## Package advisory (CVE-2026-55255)\n\nAffected packages:\n\n- `langflow < 1.9.1`\n\nPatched in:\n\n- `langflow 1.9.1`\n\nSource: https://github.com/advisories/GHSA-qrpv-q767-xqq2","depth":"abyssal","depthScore":71,"depthScoreParts":{"impact":46.2,"likelihood":0.2,"exploitation":25,"ransomware":0},"changes":[{"seq":217655,"id":"CVE-2026-55255","ts":1791398629536,"field":"cvss","old":"9.9","new":"8.4"},{"seq":217654,"id":"CVE-2026-55255","ts":1791398629536,"field":"severity","old":"critical","new":"high"},{"seq":5351,"id":"CVE-2026-55255","ts":1788887269864,"field":"exploit_available","old":"false","new":"true"},{"seq":4234,"id":"CVE-2026-55255","ts":1788886384740,"field":"exploit_available","old":"true","new":"false"},{"seq":2990,"id":"CVE-2026-55255","ts":1788883048391,"field":"exploit_available","old":"false","new":"true"},{"seq":2019,"id":"CVE-2026-55255","ts":1788882452811,"field":"exploit_available","old":"true","new":"false"},{"seq":1095,"id":"CVE-2026-55255","ts":1788881889680,"field":"exploit_available","old":"false","new":"true"},{"seq":177,"id":"CVE-2026-55255","ts":1787603660750,"field":"epss","old":"0.29052","new":"0.00887"},{"seq":92,"id":"CVE-2026-55255","ts":1784920493527,"field":"epss","old":"0.0056","new":"0.29052"},{"seq":57,"id":"CVE-2026-55255","ts":1783533111670,"field":"exploited","old":"false","new":"true"},{"seq":56,"id":"CVE-2026-55255","ts":1783533111670,"field":"kev","old":"false","new":"true"},{"seq":53,"id":"CVE-2026-55255","ts":1783532625146,"field":"exploited","old":"true","new":"false"},{"seq":52,"id":"CVE-2026-55255","ts":1783532625146,"field":"kev","old":"true","new":"false"},{"seq":49,"id":"CVE-2026-55255","ts":1783529207812,"field":"exploited","old":"false","new":"true"},{"seq":48,"id":"CVE-2026-55255","ts":1783529207812,"field":"kev","old":"false","new":"true"}]}