HIGH: CVE-2025-34291 actively exploited — langflow langflow

CVE: CVE-2025-34291

CVSS: 8.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: HIGH

Status: ✅ Confirmed exploited in the wild (CISA KEV)

Affected

• langflow langflow

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.

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE
• CISA Known Exploited Vulnerabilities Catalog

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

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._