KEV Entry

CVE-2025-34291

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2025-34291

2026-05-21 00:00 UTC

Timestamps

2026-05-21

2026-05-21

Scope

KEV entry: Langflow Origin Validation Error Vulnerability | Affected: Langflow / Langflow | Description: 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. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-06-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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

References
  • {'id': 'CVE-2025-34291', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-34291'}

86033a2c-5c40-45b0-b6a1-5c0739789218

405284c2-e461-4670-8979-7fd2c9755a60

2026-05-21 21:00 UTC

2026-05-21 21:00 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-346"
  ],
  "date_added": "2026-05-21",
  "due_date": "2026-06-04",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Langflow",
  "vendorProject": "Langflow",
  "vulnerabilityName": "Langflow Origin Validation Error Vulnerability"
}
 -
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