CVE-2026-4786

UNKNOWN 0.0

Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

5th

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.

CWE	CWE-77
Vendor	python software foundation
Product	cpython
Published	Apr 13, 2026
Last Updated	Apr 14, 2026

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Affected Versions

Python Software Foundation / CPython

0 < 3.15.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python/cpython/pull/148170 github.com: https://github.com/python/cpython/issues/148169 mail.python.org: https://mail.python.org/archives/list/[email protected]/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/ github.com: https://github.com/python/cpython/commit/c5767a72838a8dda9d6dc5d3558075b055c56bca github.com: https://github.com/python/cpython/commit/d22922c8a7958353689dc4763dd72da2dea03fff github.com: https://github.com/python/cpython/commit/f4654824ae0850ac87227fb270f9057477946769

Credits

🔍 an7y Seth Larson Stan Ulbrych