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CVE-2025-34291: Langflow Origin Validation Error Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-05-21
• EPSS: 92.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-05 · updated 2026-10-15
• Weakness: CWE-346

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.

Affected products

• IBM Langflow OSS: through 1.6.9

References

• https://github.com/langflow-ai/langflow
• 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
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291
• https://www.crowdsec.net/vulntracking-report/cve-2025-34291

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