---
cve: "CVE-2025-34291"
severity: "CRITICAL"
cvss: 9.4
epss: "83.8%"
vendor: "Langflow"
kev: true
exploited: true
published: "2025-12-05 23:15:47"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T03:54:26+02:00"
---

# CVE-2025-34291

> 9.4 CRITICAL · ⚠️ CISA KEV (105 Tage) · 🔓 Exploited · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Referenzen

- <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>
- <https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291>
- <https://www.crowdsec.net/vulntracking-report/cve-2025-34291>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-34291) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_