NuytsTech Security

CVE-2026-4786

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Mitgation of CVE-2026-4519 was incomplete. If the URL contained “%action” the mitigation could be bypassed for certain browser types the “webbrowser.open()” API could have commands injected into the underlying shell. See CVE-2026-4519 for details.

More information : https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53

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