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Vulnerability details: VCID-ysnc-jyxb-6qcy
Vulnerability ID VCID-ysnc-jyxb-6qcy
Aliases CVE-2025-34291
GHSA-577h-p2hh-v4mv
PYSEC-2025-78
Summary 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
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-346 Origin Validation Error
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 8.8 https://github.com/langflow-ai/langflow
cvssv3.1 8.8 https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
cvssv3.1 8.8 https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce
Reference id Reference type URL
https://github.com/langflow-ai/langflow
https://github.com/langflow-ai/langflow/pull/10139
https://github.com/langflow-ai/langflow/pull/10696
https://github.com/langflow-ai/langflow/pull/9240
https://github.com/langflow-ai/langflow/pull/9441
https://github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2025-78.yaml
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291
https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce
CVE-2025-34291 https://nvd.nist.gov/vuln/detail/CVE-2025-34291
CVE-2025-34291 https://www.crowdsec.net/vulntracking-report/cve-2025-34291
GHSA-577h-p2hh-v4mv https://github.com/advisories/GHSA-577h-p2hh-v4mv
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/langflow-ai/langflow
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2026-06-02T04:23:28.724165+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2025-78.yaml 38.6.0