Origin Validation Error Affecting langflow-base package, versions [,0.9.3)
Threat Intelligence
Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-LANGFLOWBASE-14221425
- published7 Dec 2025
- disclosed5 Dec 2025
- creditFenix Qiao, Shuyang Wang
Introduced: 5 Dec 2025
CVE-2025-34291 (opens in a new tab)How to fix?
Upgrade langflow-base to version 0.9.3 or higher.
Overview
Affected versions of this package are vulnerable to Origin Validation Error via an overly permissive CORS configuration in the refresh endpoint. An attacker can gain unauthorized access to authentication tokens and execute arbitrary code by enticing a victim to visit a malicious webpage that performs cross-origin requests with credentials.
Note: The option was added in version 0.6.0 (used in langflow 1.6.x) to restrict allowed origins with LANGFLOW_CORS_ORIGINS. This will become the default behavior, with permissive settings (origins = *) being opt-in, in a future release.