{"id":"CVE-2025-34291","aliases":["EUVD-2025-201507","GHSA-577h-p2hh-v4mv","PYSEC-2025-78","ROOT-APP-PYPI-CVE-2025-34291"],"status":"published","title":"Langflow \u003c= 1.6.9 CORS Misconfiguration to Token Hijack \u0026 RCE","description":"Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","severity":{"version":"4.0","score":9.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.93216,"percentile":0.99837,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":true},"cwes":["CWE-346"],"published":"2025-12-05T22:27:26Z","modified":"2026-10-28T02:30:26Z","kev":{"date_added":"2026-05-21","due_date":"2026-06-04","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are 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Party Advisory","evidence","web"]},{"url":"https://github.com/langflow-ai/langflow","tags":["product","Product","package"]},{"url":"https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce","tags":["third-party-advisory","Third Party Advisory","advisory","web"]},{"url":"https://www.crowdsec.net/vulntracking-report/cve-2025-34291","tags":["third-party-advisory","Third Party Advisory","advisory","web"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291","tags":["government-resource","US Government Resource","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-34291","tags":["advisory"]},{"url":"https://github.com/langflow-ai/langflow/pull/10139","tags":["web"]},{"url":"https://github.com/langflow-ai/langflow/pull/10696","tags":["web"]},{"url":"https://github.com/langflow-ai/langflow/pull/9240","tags":["web"]},{"url":"https://github.com/langflow-ai/langflow/pull/9441","tags":["web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2025-78.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-577h-p2hh-v4mv","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/34xxx/CVE-2025-34291.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-34291","title":"Langflow \u003c= 1.6.9 CORS Misconfiguration to Token Hijack \u0026 RCE","description":"Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. 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An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","status":"published","published":"2025-12-05T22:27:26Z","modified":"2026-10-08T15:21:21Z","cvss":[{"version":"4.0","score":9.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"}],"exploited_since":"2026-05-21","updated_at":"2026-11-02T17:27:32.18003Z"}],"ghsa":[{"id":"GHSA-577h-p2hh-v4mv","title":"Langflow CORS misconfiguration enables Account Takeover and RCE","description":"Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. 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Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","status":"published","published":"2025-12-06T00:31:36Z","modified":"2026-05-29T20:51:09Z","cvss":[{"version":"4.0","score":9.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:40:15.638885Z"}],"kev":[{"id":"CVE-2025-34291","title":"Langflow Origin Validation Error Vulnerability","description":"Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. 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An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","status":"published","published":"2025-12-05T22:27:26.438Z","modified":"2026-10-28T02:30:26.437301823Z","cvss":[{"version":"4.0","score":9.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:44:48.02508Z"},{"id":"GHSA-577h-p2hh-v4mv","title":"Langflow CORS misconfiguration enables Account Takeover and RCE","description":"Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. 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Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","status":"published","published":"2025-12-06T00:31:36Z","modified":"2026-05-29T21:00:16.278370494Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":9.4,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:46:37.864461Z"},{"id":"PYSEC-2025-78","description":"Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.","status":"published","published":"2025-12-05T23:15:47.433Z","modified":"2026-06-10T17:01:58.704525618Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:54.242332Z"},{"id":"ROOT-APP-PYPI-CVE-2025-34291","title":"CVE-2025-34291 in rootio-langflow - Patched by Root","description":"Root has patched CVE-2025-34291 in the rootio-langflow package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-06-03T15:13:28Z","modified":"2026-06-03T19:30:16.973208053Z","updated_at":"2026-11-02T15:53:27.940619Z"}]}}