Vulnerability DatabaseCVE-2026-28499
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CVE-2026-28499
Published:March 18, 2026
Updated:May 18, 2026
LeafKit HTML-escaping is not working correctly when a template prints a collection (Array / Dictionary) via #(value). This can result in XSS, allowing potentially untrusted input to be rendered unescaped. Fixed in 1.14.2
Affected Packages
github.com/vapor/leaf-kit (SWIFT):
Affected version(s) >=0.0.1 <1.14.2
Fix Suggestion:
Update to version 1.14.2
Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (6)
https://github.com/vapor/leaf-kit/security/advisories/GHSA-6jj5-j4j8-8473
https://github.com/advisories/GHSA-6jj5-j4j8-8473
https://github.com/vapor/leaf-kit
https://nvd.nist.gov/vuln/detail/CVE-2026-28499
https://github.com/vapor/leaf-kit/releases/tag/1.14.2
https://github.com/vapor/leaf-kit/commit/6044b844caa858a0c5f2505ac166f5a057c990dc
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-80
Improper Encoding or Escaping of Output
CWE-116
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
EPSS
Base Score:
0.01