CVE-2026-28499

UNKNOWN 0.0

LeafKit's HTML escaping may be skipped for Collection values, enabling XSS

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

LeafKit is a templating language with Swift-inspired syntax. Prior to version 1.14.2, HTML escaping doesn't work correctly when a template prints a collection (Array / Dictionary) via `#(value)`. This can result in XSS, allowing potentially untrusted input to be rendered unescaped. Version 1.14.2 fixes the issue.

CWE	CWE-79 CWE-80 CWE-116
Vendor	vapor
Product	leaf-kit
Published	Mar 18, 2026
Last Updated	Mar 18, 2026

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Affected Versions

vapor / leaf-kit

< 1.14.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/vapor/leaf-kit/security/advisories/GHSA-6jj5-j4j8-8473 github.com: https://github.com/vapor/leaf-kit/commit/6044b844caa858a0c5f2505ac166f5a057c990dc github.com: https://github.com/vapor/leaf-kit/releases/tag/1.14.2