[CVE-2026-4786] Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
April 13, 2026
9:53 p.m.
There is a HIGH severity vulnerability affecting CPython.
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.
Please see the linked CVE ID for the latest information on affected versions:
63
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Seth Larson