CVE-2026-4786

| EUVD-2026-22134 HIGH
2026-04-13 PSF GHSA-cccx-m78h-m3xw
Command Injection
7.0
CVSS 4.0
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CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
Re-analysis Queued
Apr 17, 2026 - 15:22 vuln.today
cvss_changed
Analysis Generated
Apr 15, 2026 - 12:37 vuln.today
CVSS Changed
Apr 13, 2026 - 22:52 NVD
7.0 (HIGH)

DescriptionNVD

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.

AnalysisAI

Command injection in CPython's webbrowser.open() API bypasses previous CVE-2026-4519 mitigation via specially crafted URLs containing '%action' patterns. All CPython versions prior to 3.15.0 are affected, allowing local attackers with user interaction to execute arbitrary commands through underlying shell injection. …

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RemediationAI

Within 24 hours: inventory all systems running CPython versions prior to 3.15.0, particularly those exposed to user-supplied URLs or web-based input. Within 7 days: upgrade all affected CPython installations to version 3.15.0 or later. …

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CVE-2026-4786 vulnerability details – vuln.today
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