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 platform-pythonUpgrade python3.11-debugUpgrade python3.11-rpm-macrosUpgrade python3-testUpgrade python3-debugUpgrade python3.14-freethreading-idleUpgrade python3.12-tkinterUpgrade python3.14-tkinterUpgrade python3.11-develUpgrade python3-develUpgrade python3-tkinterUpgrade python3.12Upgrade python3.11-idleUpgrade python3.14-libsUpgrade python3.14-freethreading-tkinterUpgrade python3.12-debugUpgrade python3.12-rpm-macrosUpgrade platform-python-debugUpgrade platform-python-develUpgrade python3.11Upgrade python3.14-testUpgrade python3.12-libsUpgrade python3.14-idleUpgrade python3.12-idleUpgrade python3.12-develUpgrade python3.11-libsUpgrade python3.14-freethreading-testUpgrade python3.11-tkinterUpgrade python3.14-debugUpgrade python3-idleUpgrade python3-libsUpgrade python3.14-freethreading-debugUpgrade python3.14-develUpgrade python3.14-freethreadingUpgrade python3.14-freethreading-develUpgrade python3.14Upgrade python-unversioned-commandUpgrade python3Upgrade python3.14-freethreading-libsUpgrade python3.12-testUpgrade python3.11-test	Apr 29, 2026	Apr 27, 2026
Alpine Linux	—	Upgrade python3	Aug 17, 2026	Apr 13, 2026
Amazon Linux Ami 2	—	Upgrade python3Upgrade python-toolsUpgrade python-testUpgrade python-libsUpgrade python-debuginfoUpgrade python3-toolsUpgrade python-develUpgrade python3-testUpgrade pythonUpgrade python3-debuginfoUpgrade python3-debugUpgrade python3-develUpgrade python3-tkinterUpgrade python3-libsUpgrade tkinterUpgrade python-debug	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade python3-libsUpgrade python3.11-debugsourceUpgrade python3.14-freethreading-libsUpgrade python3.13-debuginfoUpgrade python3.11-tkinterUpgrade python3.14-debugsourceUpgrade python3.13-libsUpgrade python3.14Upgrade python3.13-debugUpgrade python3.12-develUpgrade python3.13-testUpgrade python3.12Upgrade python3.12-debugUpgrade python3-idleUpgrade python3.14-idleUpgrade python3.14-libsUpgrade python3-tkinterUpgrade python3.11-develUpgrade python3.12-libsUpgrade python3.12-debugsourceUpgrade python3.13-idleUpgrade python3.14-freethreading-testUpgrade python3-develUpgrade python3.12-tkinterUpgrade python3.14-debuginfoUpgrade python3.13-freethreadingUpgrade python3.14-freethreadingUpgrade python3.11-debugUpgrade python3.9-debugsourceUpgrade python3.13-debugsourceUpgrade python3.13Upgrade python3.11Upgrade python3.11-testUpgrade python3.14-testUpgrade python3.9-debuginfoUpgrade python-unversioned-commandUpgrade python3.14-freethreading-develUpgrade python3Upgrade python3-testUpgrade python3.13-freethreading-debugUpgrade python3.12-testUpgrade python3.12-debuginfoUpgrade python3.14-tkinterUpgrade python3.12-idleUpgrade python3.14-debugUpgrade python3.11-idleUpgrade python3.14-freethreading-tkinterUpgrade python3.14-develUpgrade python3.13-develUpgrade python3-debugUpgrade python3.13-tkinterUpgrade python3.11-libsUpgrade python3.11-debuginfoUpgrade python3.14-freethreading-debugUpgrade python3.14-freethreading-idle	May 4, 2026	Apr 13, 2026
Freebsd	—	Upgrade python310Upgrade python312Upgrade python313Upgrade python311Upgrade python314Upgrade python313t	Apr 17, 2026	Apr 13, 2026
Nutanix Ahv	—	Upgrade Nutanix AHV to the latest version	Jul 2, 2026	Jul 1, 2026
Oracle_linux	—	Upgrade platform-python-develUpgrade python3-idleUpgrade python3.12-idleUpgrade python3-debugUpgrade python3.12-testUpgrade python3.11-libsUpgrade platform-python-debugUpgrade python3-develUpgrade python3.11-idleUpgrade python3.12Upgrade python3-tkinterUpgrade python3.12-tkinterUpgrade python3.12-debugUpgrade python3.12-develUpgrade platform-pythonUpgrade python3-testUpgrade python3.11-develUpgrade python-unversioned-commandUpgrade python3.11-testUpgrade python3.12-rpm-macrosUpgrade python3.12-libsUpgrade python3.11-rpm-macrosUpgrade python3.11Upgrade python3-libsUpgrade python3.11-debugUpgrade python3.11-tkinterUpgrade python3	Apr 29, 2026	Apr 13, 2026
Redhat_linux	—	Upgrade python3.14-freethreading-develUpgrade python3.14-freethreading-libsUpgrade python3.12-libsUpgrade python3.11-testUpgrade platform-python-develUpgrade python3.14-testUpgrade python-debuginfoUpgrade python3.14-debuginfoUpgrade pythonUpgrade python3.11-rpm-macrosUpgrade python3.9-debuginfoUpgrade python-debugUpgrade python3.12-rpm-macrosUpgrade python3.14-debugsourceUpgrade python3-develUpgrade python3.11-tkinterUpgrade python3.14-freethreadingUpgrade python-toolsUpgrade python-libsUpgrade python3.14-idleUpgrade python3-debuginfoUpgrade python3.12-develUpgrade python3.12-debugUpgrade python3.12-debugsourceUpgrade python-unversioned-commandUpgrade python3.11-debugsourceUpgrade python3-tkinterUpgrade python3.11-debugUpgrade python3.11Upgrade python3.11-develUpgrade python3.14Upgrade python3.14-freethreading-testUpgrade python3-idleUpgrade python3.14-libsUpgrade python3Upgrade python3.9-debugsourceUpgrade python3.12Upgrade python3.12-tkinterUpgrade python3-libsUpgrade python3.14-develUpgrade python3.14-freethreading-tkinterUpgrade python3-testUpgrade python3.12-idleNo solution existsUpgrade python3.12-debuginfoUpgrade python3.11-idleUpgrade python3-debugsourceUpgrade python3.14-freethreading-idleUpgrade python3.11-debuginfoUpgrade python-develUpgrade platform-pythonUpgrade python-testUpgrade python3.12-testUpgrade python3.14-tkinterUpgrade python3-debugUpgrade python3.11-libsUpgrade tkinterUpgrade python3.14-debugUpgrade python3.14-freethreading-debugUpgrade platform-python-debug	Apr 28, 2026	Apr 13, 2026
Rocky_linux	—	Upgrade python3.11Upgrade python3.12-develUpgrade python3-debuginfoUpgrade python3.14-debugUpgrade python3.14-freethreading-develUpgrade python3.9-debugsourceUpgrade python3.9-debuginfoUpgrade python3.12-testUpgrade python3.14Upgrade python3-idleUpgrade python3.11-tkinterUpgrade python3.14-freethreading-libsUpgrade platform-python-debugUpgrade python3.12-libsUpgrade python3-libsUpgrade python3.14-develUpgrade python3.14-idleUpgrade platform-python-develUpgrade python3.11-testUpgrade python3.14-freethreading-debugUpgrade python3.11-libsUpgrade platform-pythonUpgrade python3.12-debugsourceUpgrade python3Upgrade python3.12-idleUpgrade python3.11-debuginfoUpgrade python3.12-debugUpgrade python3-debugsourceUpgrade python3-tkinterUpgrade python3.11-debugUpgrade python3.12-tkinterUpgrade python3.11-idleUpgrade python3.11-debugsourceUpgrade python3-debugUpgrade python3.12-debuginfoUpgrade python3.11-develUpgrade python3-testUpgrade python3.14-debugsourceUpgrade python3-develUpgrade python3.14-freethreading-idleUpgrade python3.14-freethreadingUpgrade python3.14-debuginfoUpgrade python3.14-freethreading-testUpgrade python3.14-testUpgrade python3.14-freethreading-tkinterUpgrade python3.12Upgrade python3.14-tkinterUpgrade python3.14-libs	Apr 29, 2026	Apr 28, 2026
Suse	—	Upgrade python312-baseUpgrade python310-tkUpgrade python313-cursesUpgrade python39-dbmUpgrade python312Upgrade python313-idleUpgrade libpython3_10-1_0Upgrade python3-doc-devhelpUpgrade libpython3_6m1_0-32bitUpgrade python3-cursesUpgrade python3Upgrade python3-testsuiteUpgrade python310-idleUpgrade python312-idleUpgrade python3-toolsUpgrade python313-dbmUpgrade python3-docUpgrade python310-cursesUpgrade python310-toolsUpgrade python312-tkUpgrade python313-baseUpgrade libpython3_9-1_0Upgrade libpython3_13-1_0Upgrade libpython3_4m1_0Upgrade python312-toolsUpgrade python3-idleUpgrade python310Upgrade python312-cursesUpgrade python39-baseUpgrade python313-tkUpgrade python312-develUpgrade libpython3_6m1_0Upgrade python313-toolsUpgrade libpython3_4m1_0-32bitUpgrade python313Upgrade python39Upgrade python312-dbmUpgrade python3-tkUpgrade python310-develUpgrade python310-baseUpgrade python3-dbmUpgrade python310-dbmUpgrade python313-develUpgrade python3-develUpgrade python3-baseUpgrade libpython3_12-1_0Upgrade python39-curses	May 26, 2026	Apr 28, 2026
Ubuntu	—	Upgrade python3.10Upgrade python3.12Upgrade libpython3.10Upgrade python3.14Upgrade libpython3.14Upgrade libpython3.12t64	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

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CVSS Details

Covered by Rapid7

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