VulnerabilityAnalyzed
CVE-2026-28499
This can result in XSS, allowing potentially untrusted input to be rendered unescaped.
MEDIUM 6.9EPSS 0.27%
Does this matter?
Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.27% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79, CWE-80, CWE-116
- Affected
- vapor/leafkit
- Source
- security-advisories@github.com
References
- https://github.com/vapor/leaf-kit/commit/6044b844caa858a0c5f2505ac166f5a057c990dcPatch
- https://github.com/vapor/leaf-kit/releases/tag/1.14.2Release Notes
- https://github.com/vapor/leaf-kit/security/advisories/GHSA-6jj5-j4j8-8473Exploit, Vendor Advisory
- https://github.com/vapor/leaf-kit/security/advisories/GHSA-6jj5-j4j8-8473Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.