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webbrowser.open() allows leading dashes in URLs

🗓️ 25 Mar 2026 08:05:36Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 1 Views

The web browser open function accepts URLs with leading dashes, enabling possible address validation bypass.

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Detection
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Rows per page
Vulners
Node
microsoftazl3_python3_3.12.9-10Range<3.12.9-10
OR
microsoftcbl2_python3_3.9.19-19Range<3.9.19-20
OR
microsoftazl3_python3_3.12.9-9Range<3.12.9-10

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31 Mar 2026 22:18Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.13.3
CVSS 47
EPSS0.00216
SSVC
web browser openleading dashesvalidation bypass
1