PSF-0000-CVE-2026-4786

vendorUSosv

view advisory published 2026-04-13Licence: per source

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-4786US	—	0.29% (21st)	—	2026-04-13
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…

references

External citations — patches, advisories, analysis.

https://github.com/python/cpython/issues/148169REPORT
https://github.com/python/cpython/pull/148170WEB
https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/ADVISORY

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