Name: CVE-2026-4786: Improper Neutralization of Special Elements used in a Command
Creator: Rapid7
Published: 2026-04-13T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-4786, CWE-77, CWE-88, CVSS 7.1, EPSS 0.00485

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.

CVSS Details

CVSS 4.0 Base Score: 7 (HIGH)
CVSS 4.0 Vector: (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)
CVSS 3.1 Base Score: 7.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade python3.12-tkinterUpgrade python3-tkinterUpgrade python3.14-freethreading-idleUpgrade platform-pythonUpgrade python3.11-rpm-macrosUpgrade python3.12Upgrade python3.11-idleUpgrade python3-develUpgrade python3.11-debugUpgrade python3-debugUpgrade python3.14-tkinterUpgrade python3.14-freethreading-tkinterUpgrade python3.11-develUpgrade python3-testUpgrade python3.14-libsUpgrade python3.14-freethreading-debugUpgrade python3.14-testUpgrade python3Upgrade python3.14-develUpgrade platform-python-debugUpgrade python3.14Upgrade python3.12-develUpgrade python3.11-libsUpgrade python3.12-libsUpgrade python3.14-idleUpgrade python3-libsUpgrade python3-idleUpgrade python3.11Upgrade python3.12-rpm-macrosUpgrade python3.12-idleUpgrade python3.14-freethreading-develUpgrade python3.11-tkinterUpgrade python3.14-freethreading-libsUpgrade python3.11-testUpgrade python3.12-debugUpgrade python3.14-freethreading-testUpgrade python3.14-debugUpgrade python3.12-testUpgrade platform-python-develUpgrade python3.14-freethreadingUpgrade python-unversioned-command	Apr 29, 2026	Apr 27, 2026
Alpine Linux	—	Upgrade python3	Aug 17, 2026	Apr 13, 2026
Amazon Linux Ami 2	—	Upgrade tkinterUpgrade python-debugUpgrade python3-libsUpgrade pythonUpgrade python3-debugUpgrade python3-debuginfoUpgrade python3-develUpgrade python3-tkinterUpgrade python-libsUpgrade python-toolsUpgrade python3-toolsUpgrade python-debuginfoUpgrade python3Upgrade python3-testUpgrade python-testUpgrade python-devel	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade python3.14-debuginfoUpgrade python3.14-freethreadingUpgrade python3.13-idleUpgrade python3.14-freethreading-testUpgrade python3.11-develUpgrade python3.12-debugsourceUpgrade python3-develUpgrade python3.12-tkinterUpgrade python3.13-freethreadingUpgrade python3.13-testUpgrade python3.14-debugsourceUpgrade python3.12-develUpgrade python3.11-debugsourceUpgrade python3.13-debuginfoUpgrade python3-libsUpgrade python3.14-freethreading-develUpgrade python3.11Upgrade python3Upgrade python3.14-freethreading-libsUpgrade python3.11-tkinterUpgrade python-unversioned-commandUpgrade python3.13-debugUpgrade python3.13-libsUpgrade python3-tkinterUpgrade python3.12Upgrade python3.12-debugUpgrade python3.14-libsUpgrade python3-idleUpgrade python3.11-debugUpgrade python3.11-testUpgrade python3.14-idleUpgrade python3.9-debuginfoUpgrade python3.14Upgrade python3.9-debugsourceUpgrade python3.12-libsUpgrade python3.14-testUpgrade python3.13-debugsourceUpgrade python3.13Upgrade python3.12-testUpgrade python3.12-debuginfoUpgrade python3-testUpgrade python3.12-idleUpgrade python3.13-tkinterUpgrade python3.13-freethreading-debugUpgrade python3.14-tkinterUpgrade python3.14-freethreading-idleUpgrade python3.14-freethreading-debugUpgrade python3.14-debugUpgrade python3.14-freethreading-tkinterUpgrade python3.14-develUpgrade python3.13-develUpgrade python3.11-idleUpgrade python3.11-libsUpgrade python3.11-debuginfoUpgrade python3-debug	May 4, 2026	Apr 13, 2026
Freebsd	—	Upgrade python311Upgrade python314Upgrade python313tUpgrade python313Upgrade python312Upgrade python310	Apr 17, 2026	Apr 13, 2026
Nutanix Ahv	—	Upgrade Nutanix AHV to the latest version	Jul 2, 2026	Jul 1, 2026
Oracle_linux	—	Upgrade python3.12-develUpgrade python3.11-develUpgrade python3.11-tkinterUpgrade platform-pythonUpgrade python3-testUpgrade python3.11-rpm-macrosUpgrade python3.12-debugUpgrade python3-tkinterUpgrade python3Upgrade python3.11-testUpgrade python3.12-libsUpgrade python3.12-rpm-macrosUpgrade python3.11Upgrade python3-libsUpgrade python3.11-debugUpgrade python-unversioned-commandUpgrade python3.12-tkinterUpgrade platform-python-develUpgrade python3.12Upgrade python3-debugUpgrade python3.12-testUpgrade python3.11-libsUpgrade platform-python-debugUpgrade python3-develUpgrade python3.11-idleUpgrade python3-idleUpgrade python3.12-idle	Apr 29, 2026	Apr 13, 2026
Redhat_linux	—	Upgrade python3-debugUpgrade platform-python-debugUpgrade python3.14-develUpgrade python3.14-tkinterUpgrade python-develUpgrade python3.14-freethreading-idleUpgrade python-testUpgrade python3-debugsourceUpgrade python3.14-debugUpgrade python3.12-testUpgrade platform-pythonUpgrade python3.11-debuginfoUpgrade python3.12-idleUpgrade python3-testNo solution existsUpgrade python3.12-debuginfoUpgrade python3.11-idleUpgrade python3.14-freethreading-tkinterUpgrade python3.11-libsUpgrade tkinterUpgrade python3.14-freethreading-debugUpgrade python3.11-debugUpgrade python-libsUpgrade python3-tkinterUpgrade pythonUpgrade python3.12-libsUpgrade python3.14-debugsourceUpgrade python3.11-tkinterUpgrade python3-idleUpgrade python3.11-testUpgrade python-debugUpgrade python3.14-debuginfoUpgrade platform-python-develUpgrade python3.11Upgrade python3-develUpgrade python3.14-freethreading-develUpgrade python3.14-freethreading-libsUpgrade python3.12-develUpgrade python-toolsUpgrade python3.14-idleUpgrade python3.14-freethreadingUpgrade python3.9-debuginfoUpgrade python3.14-libsUpgrade python3.14-freethreading-testUpgrade python3.14Upgrade python3.12-debugsourceUpgrade python3.12-debugUpgrade python3.11-develUpgrade python3.11-debugsourceUpgrade python-unversioned-commandUpgrade python3-libsUpgrade python3.11-rpm-macrosUpgrade python-debuginfoUpgrade python3-debuginfoUpgrade python3.9-debugsourceUpgrade python3Upgrade python3.12-tkinterUpgrade python3.12Upgrade python3.14-testUpgrade python3.12-rpm-macros	Apr 28, 2026	Apr 13, 2026
Rocky_linux	—	Upgrade python3.12-debuginfoUpgrade python3.12Upgrade python3.14-debugsourceUpgrade python3.14-freethreading-tkinterUpgrade python3.11-debugsourceUpgrade python3.11-develUpgrade python3.14-debuginfoUpgrade python3.12-tkinterUpgrade python3.14-tkinterUpgrade python3.14-freethreading-testUpgrade python3.14-testUpgrade python3-debugUpgrade python3.14-freethreadingUpgrade python3.11-idleUpgrade python3.14-libsUpgrade python3-testUpgrade python3-tkinterUpgrade python3-develUpgrade python3.11-debugUpgrade python3.14-freethreading-idleUpgrade python3.12-develUpgrade python3.12-debugsourceUpgrade python3.14Upgrade python3.12-testUpgrade python3.12-idleUpgrade python3.14-idleUpgrade python3.14-develUpgrade python3-libsUpgrade python3.14-debugUpgrade python3-idleUpgrade platform-python-debugUpgrade python3.9-debuginfoUpgrade python3.14-freethreading-libsUpgrade python3-debuginfoUpgrade python3.11-tkinterUpgrade python3Upgrade python3.11-testUpgrade python3.11-libsUpgrade platform-pythonUpgrade python3.14-freethreading-debugUpgrade python3.14-freethreading-develUpgrade python3-debugsourceUpgrade python3.9-debugsourceUpgrade python3.11-debuginfoUpgrade python3.12-debugUpgrade python3.11Upgrade python3.12-libsUpgrade platform-python-devel	Apr 29, 2026	Apr 28, 2026
Suse	—	Upgrade python310-baseUpgrade python310-develUpgrade python312-dbmUpgrade libpython3_12-1_0Upgrade python39-baseUpgrade python3-dbmUpgrade python39-cursesUpgrade libpython3_4m1_0Upgrade python312-cursesUpgrade python312-toolsUpgrade python3-baseUpgrade python313-tkUpgrade libpython3_6m1_0Upgrade python39Upgrade python312-develUpgrade python310-dbmUpgrade python313Upgrade python313-toolsUpgrade libpython3_4m1_0-32bitUpgrade libpython3_13-1_0Upgrade python3-idleUpgrade python310Upgrade python313-develUpgrade python3-develUpgrade python3-tkUpgrade python3-testsuiteUpgrade python310-toolsUpgrade python3-docUpgrade python313-dbmUpgrade python312-tkUpgrade python312-baseUpgrade python310-cursesUpgrade python312Upgrade libpython3_10-1_0Upgrade python3-toolsUpgrade python39-dbmUpgrade python313-cursesUpgrade python310-tkUpgrade libpython3_6m1_0-32bitUpgrade python313-idleUpgrade libpython3_9-1_0Upgrade python3-doc-devhelpUpgrade python3Upgrade python312-idleUpgrade python3-cursesUpgrade python313-baseUpgrade python310-idle	May 26, 2026	Apr 28, 2026
Ubuntu	—	Upgrade libpython3.14Upgrade libpython3.12t64Upgrade python3.14Upgrade python3.12Upgrade libpython3.10Upgrade python3.10	Jul 6, 2026	Apr 13, 2026
Vmware Photon_os	—	Use 'tdnf update' to upgrade all packages to the latest version.	May 27, 2026	Apr 13, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence