CVE-2026-27120

MEDIUM

6.1

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.

Details CVE

Score CVSS v3.16.1

SeveriteMEDIUM

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

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurREQUIRED

Publie2/20/2026

Derniere modification3/2/2026

Sourcenvd

Observations honeypot0

Produits affectes

vapor:leafkit

Faiblesses (CWE)

CWE-75CWE-79CWE-87

References

https://github.com/vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34(security-advisories@github.com)

https://github.com/vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7p(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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