Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2025-34291

CVE-2025-34291CRITICAL

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   H   H   H    9.4   .9281   99.8   YES

AFFECTED
  Product   Versions     Fixed
  Langflow  unspecified  —

TIMELINE
  Apr 15  Reserved by VulnCheck
  Dec 5   Published (CNA: VulnCheck)
  May 21  Added to CISA KEV, remediation due 2026-06-04
  Jun 5   DUE DATE PASSED — CVE-2025-34291 (Langflow). CISA remediation deadline was June 4, 2026; still in catalog.

CWE-346 · CNA: VulnCheck · CVSS v4.0 · 5 references · KEV due June 4, 2026

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
April 15, 2025	Reserved	Reserved by VulnCheck
December 5, 2025	Published	Published (CNA: VulnCheck)
May 21, 2026	KEV ADDED	Added to CISA KEV, remediation due 2026-06-04
June 5, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2025-34291 (Langflow). CISA remediation deadline was June 4, 2026; still in catalog.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Langflow	Langflow	—	—	—

Weaknesses

CWE-346

References (5)

https://github.com/langflow-ai/langflow [product]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291 [government-resource]
https://www.crowdsec.net/vulntracking-report/cve-2025-34291 [third-party-advisory]
https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform [technical-description, exploit]
https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce [third-party-advisory]

Authoritative record: CVE-2025-34291 at cve.org

Vendors: langflow

Weaknesses: CWE-346

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-34291 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.