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Vulnerabilities

Vulnerability · CVE-2025-62379

Reflex is a library to build full-stack web apps in pure Python.

Published Oct 15, 2025 · catalog updated Oct 15, 2025 · Reflex is a library

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-62379. EPSS is 0.26%. Act only if a listed version of Reflex is a library is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Reflex is a library).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Version ranges on file
Affected products
vendor reflex-dev reflex 0.5.4, < 0.8.15

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_C

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor reflex-dev reflex 0.5.4, < 0.8.150.5.4, < 0.8.15

How to fix CVE-2025-62379

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-62379. EPSS is 0.26%. Act only if a listed version of Reflex is a library is installed.

Which versions are affected?

Compare what you have installed with reflex-dev reflex 0.5.4, < 0.8.15 0.5.4, < 0.8.15. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2025 · EUVD

    Detected

    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 v

  2. Oct 15, 2025 · EUVD

    Updated

    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 v

Sources

  • CVE.orgVulnerability recordCVE-2025-62379

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-62379

    30-day exploitation probability 0.26%

    first.org
  • EUVDVulnerability recordEUVD-2025-34684

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • EUVDOct 26, 2026
  • CVE.orgOct 23, 2026