CVE Watch15 de out. de 2026

CVE-2025-34291

Langflow Origin Validation Error Vulnerability

CVSS

8.8

Alta

EPSS

93.2%

p100

KEV

SIM

21 de mai. de 2026

Exploit Today

0-100

Publicado: 5 de dez. de 2025 · Última mod.: 15 de out. de 2026 · CWE-346

EPSS · 30d

92.8%EPSS · 30 dias93.2%

2026-10-082026-11-05

Ficha do catálogo KEV

Produto

Langflow / Langflow

Vulnerabilidade

Langflow Origin Validation Error Vulnerability

Adicionado ao KEV

21 de mai. de 2026

Corrigir até

4 de jun. de 2026

Uso conhecido em ransomware

Não

Descrição resumida

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.

Ação necessária

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

Notas

This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: 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

Descrição técnica

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.

Referências oficiais

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