CVE-2025-62379
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
In Reflex versions 0.5.4 through 0.8.14, the /auth-codespace endpoint assigns the redirect_to query parameter without validation and automatically clicks links on page load in GitHub Codespaces. This allows attackers to redirect users to arbitrary external URLs.
Risk Assessment
An attacker could exploit this to redirect users to malicious sites, potentially leading to phishing or data theft.
Recommendation
Update Reflex to version 0.8.15 or later; in production, ensure the GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN environment variable is not set.
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Original NVD description (English source)
Reflex is a library to build full-stack web apps in pure Python. In versions 0.5.4 through 0.8.14, the /auth-codespace endpoint automatically assigns the redirect_to query parameter value directly to client-side links without any validation and triggers automatic clicks when the page loads in a GitHub Codespaces environment. This allows attackers to redirect users to arbitrary external URLs. The vulnerable route is only registered when a Codespaces environment is detected, and the detection is controlled by environment variables. The same behavior can be activated in production if the GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN environment variable is set. The vulnerability occurs because the code assigns the redirect_to query parameter directly to a.href without any validation and immediately triggers a click (automatic navigation), allowing users to be sent to arbitrary external domains. The execution condition is based on the presence of a sessionStorage flag, meaning it triggers immediately on first visits or in incognito/private browsing windows, with no server-side origin/scheme whitelist or internal path enforcement defenses in place. This issue has been patched in version 0.8.15. As a workaround, users can ensure that GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN is not set in a production environment.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS