CVE-2025-34291: Langflow Origin Validation Error Vulnerability

CISA Known Exploited Vulnerabilities

Name

Langflow Origin Validation Error Vulnerability

Vendor

Langflow

Product

Langflow

Added to the catalog

2026-05-21

Due date for US federal agencies

2026-06-04

Weaknesses

CWE-346

Catalog version

2026.10.30

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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://github.com/langflow-ai/langflow
• https://github.com/langflow-ai/langflow/releases/tag/v1.9.3
• https://github.com/langflow-ai/langflow/issues/11465#event-25774545848
• https://nvd.nist.gov/vuln/detail/CVE-2025-34291

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2025-12-05T23:15:47.433

Last modified

2026-10-15T21:10:00.327

Weaknesses

CWE-346

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.

References

• https://github.com/langflow-ai/langflow (Product)
• https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform (Exploit, Mitigation, Third Party Advisory)
• https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce (Third Party Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291 (US Government Resource)
• https://www.crowdsec.net/vulntracking-report/cve-2025-34291 (Third Party Advisory)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:22.836Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2025-34291

CVE record

Title (CNA)

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

Assigner

VulnCheck

State

PUBLISHED

Published

2025-12-05T22:27:26.438Z

Updated

2026-10-08T15:21:21.340Z

Problem types

CWE-346 Origin Validation Error

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.

References

• https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
• https://github.com/langflow-ai/langflow
• https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce

Read on 2026-11-03T02:16:19.126Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/34xxx/CVE-2025-34291.json

GitHub Advisory Database

Also known as / affected packages

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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