> CVE-2026-4786 [HIGH]

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PUBLISHED
2026-04-13 22:16
MODIFIED
2026-04-13 22:16
CVSS_SCORE V3
7.0
EPSS (Prob. Exploit)
0.29%
Top 78.3%
DATA SOURCES:
NVD đź”— 2026-04-13 RED HAT đź”— 2026-04-19 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-08 OSV đź”— 2026-11-02 MSRC đź”— 2026-11-02

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_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

> MÉTRIQUES CVSS DÉTAILLÉES

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
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Local (L)
Exploit nécessite un accès local au système
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
Required (R)
NĂ©cessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-77

> CWE DETAILED DESCRIPTIONS

CWE-77: Improper Neutralization of Special Elements used in a Command - The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

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> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()

AFFECTED PACKAGES:
Unknown / Unknown
206 versions affected
ALIASES:
BIT-libpython-2026-4786, BIT-python-2026-4786, BIT-python-min-2026-4786, PSF-0000-CVE-2026-4786, PSF-2026-17

> HISTORIQUE DES MODIFICATIONS

Première apparition
13/04/2026 22:16
Source: NVD
đź“Š ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') - The product constructs all or part of a command using externally-influenced input from an upstream compone...
Nouvelle valeur:
CWE-77: Improper Neutralization of Special Elements used in a Command - The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not ne...
đź“Š ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') - The product constructs all or part of a command using externally-influenced input from an upstream compone...
đź“Š ENRICHISSEMENT 19/04/2026 05:01
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
đź“Š ENRICHISSEMENT 19/04/2026 05:01
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 4 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/python/cpython/issues/148169
https://github.com/python/cpython/pull/148170
https://mail.python.org/archives/list/[email protected]/thread/JQDUNJ...
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