{"id":"CVE-2025-62379","summary":"Open Redirect in reflex-dev/reflex","details":"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.","aliases":["GHSA-rfh5-c9h5-q8jm","PYSEC-2026-1868"],"modified":"2026-07-08T07:01:46.240727594Z","published":"2025-10-15T15:57:57.208Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62379.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-601"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62379.json"},{"type":"ADVISORY","url":"https://github.com/reflex-dev/reflex/security/advisories/GHSA-rfh5-c9h5-q8jm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-62379"},{"type":"FIX","url":"https://github.com/reflex-dev/reflex/commit/ade12549f3c0ddab3d7382c581bc04a3c1f989ec"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/reflex-dev/reflex","events":[{"introduced":"19ef2e645ce3871d998457b1797d5583b7bebf84"},{"fixed":"92021b262d07989fc2cb9a609757a008e5f75e5b"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.5.4"},{"fixed":"0.8.15"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-62379.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"}]}