High
Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-4786
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:31 UTC · Revision 1
Source evidence
Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
core-osv · Original sourcePublished 13 Apr 2026, 21:52 UTC
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.
osv:CVE-2026-4786
Complete source record
{
"id": "a6462fa7f6fd808e0579287f40267a4fa89f673ecd40c9fc2740f5752ed119a2",
"url": "https://osv.dev/vulnerability/CVE-2026-4786",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()",
"summary": "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.",
"evidence": "osv:CVE-2026-4786",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-4786",
"aliases": [
"BIT-libpython-2026-4786",
"BIT-python-2026-4786",
"BIT-python-min-2026-4786",
"CVE-2026-4786",
"PSF-0000-CVE-2026-4786",
"PSF-2026-17"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
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"modified": "2026-10-28T02:30:26.848129862Z",
"provider": "osv",
"references": [
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4786.json",
"https://access.redhat.com/errata/RHSA-2026:10117",
"https://access.redhat.com/errata/RHSA-2026:10140",
"https://access.redhat.com/errata/RHSA-2026:10141",
"https://access.redhat.com/errata/RHSA-2026:10711",
"https://access.redhat.com/errata/RHSA-2026:10745",
"https://access.redhat.com/errata/RHSA-2026:10774",
"https://access.redhat.com/errata/RHSA-2026:10949",
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4786.json",
"https://mail.python.org/archives/list/security-announce@python.org/thread/JQDUNJVB4AQNTJECSUKOBDU3XCJIPSE5/",
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"https://github.com/python/cpython/issues/148169",
"https://github.com/python/cpython/commit/28b4ad38067bbdad34edfcd03ad2de5f06387e53",
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},
"source_id": "core-osv",
"document_id": 493384,
"published_at": "2026-04-13T21:52:19.036+00:00"
}