Vapor vulnerabilities

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Published CVEs affecting Vapor products: 2 record(s), with severity, exploitation and fixes.

Exploited only (KEV) →

CVE-2026-28499 Medium · 6.1 CWE-79 Mar 17, 2026

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

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.

CVE-2026-27120 Medium · 6.1 CWE-75 Feb 20, 2026

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

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.