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CVE-2026-28499 - Vulnerability Analysis

MediumCVSS: 6.1

Last Updated: March 18, 2026

LeafKit - Stored XSS

Published: March 18, 2026Updated: March 18, 2026PoC AvailableRemote Exploitable

Overview

LeafKit < 1.14.2 contains a stored XSS caused by improper HTML escaping when printing collections via #(value), letting attackers render unescaped input, exploit requires untrusted input rendering.

Severity & Score

Severity: Medium

CVSS Score: 6.1

Impact

Attackers can execute arbitrary scripts in users' browsers, leading to session hijacking or data theft.

Mitigation

Upgrade to version 1.14.2 or later.

References

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

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Details

CVE ID: CVE-2026-28499
Severity: Medium
CVSS Score: 6.1
Type: stored_xss
Status: confirmed

CWE

CWE-79

CVSS Metrics

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