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PUBLISHED

2026-02-20 22:16

MODIFIED

2026-02-20 22:16

CVSS_SCORE V3

6.1

EPSS (Prob. Exploit)

0.33%

Top 74.5%

DATA SOURCES:

NVD 🔗 2026-02-20 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-04 OSV 🔗 2026-02-24

> DESCRIPTION

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.

> AFFECTED_PRODUCTS

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

> CVSS V3 METRICS

CVSS_VECTOR

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EXPLOITABILITY

2.8

IMPACT

2.7

> MÉTRIQUES CVSS DÉTAILLÉES

                CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
            

Métrique	Valeur	Interprétation
AV (Vecteur d'Attaque) Attack Vector	Network (N)	Exploit possible à distance via réseau (HTTP, API, etc.)
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)	Nécessite une action utilisateur (clic lien, ouverture fichier, etc.)
S (Périmètre) Scope	Changed (C)	Impact s'étend au-delà du composant compromis
C (Impact Confidentialité) Confidentiality Impact	Low (L)	Divulgation limitée d'informations
I (Impact Intégrité) Integrity Impact	Low (L)	Modification limitée des données possible
A (Impact Disponibilité) Availability Impact	None (N)	Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité

Low

Divulgation limitée d'informations

Intégrité

Low

Modification limitée des données possible

Disponibilité

None

Aucune interruption de service

> WEAKNESSES

CWE-75 CWE-79 CWE-87

> CWE DETAILED DESCRIPTIONS

CWE-75: Failure to Sanitize Special Elements into a Different Plane - The product does not adequately filter user-controlled input for special elements with control implications. | CWE-79: Improper Neutralization of Input During Web Page Generation - The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. | CWE-87: Improper Neutralization of Alternate XSS Syntax - The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.

> GITHUB SECURITY ADVISORY

GHSA-4hfh-fch3-5q7p MODERATE

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

AFFECTED PACKAGES:

SWIFT / github.com/vapor/leaf-kit

< 1.4.1

Fixed in: 1.4.1

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

AFFECTED PACKAGES:

Unknown / Unknown

49 versions affected

ALIASES:

GHSA-4hfh-fch3-5q7p

> HISTORIQUE DES MODIFICATIONS

Première apparition

20/02/2026 22:16

Source: NVD

📊 ENRICHISSEMENT 01/11/2026 06:58

CWE

Champ modifié: Description CWE

Ancienne valeur:

CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) - The product does not adequately filter user-controlled input for special elements with control implica...

Nouvelle valeur:

📊 ENRICHISSEMENT 01/03/2026 06:46

CWE