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CVE-2026-27120

21
FAUCET Score

CVE-2026-27120 describes a cross-site scripting (XSS) vulnerability in Leafkit, a templating language, affecting versions prior to 1.4.1. The flaw allows attackers to bypass HTML escaping mechanisms by using extended grapheme clusters, potentially leading to XSS if user-controlled variables are used within HTML attributes. This vulnerability carries a CVSS score of 6.1 (MEDIUM), indicating it can be exploited over a network with low attack complexity, requiring user interaction, and potentially impacting confidentiality and integrity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.14.1CPE matchmatch criteria
cpe:2.3:a:vapor:leafkit:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.23%
Probability of exploitation in next 30 days
EPSS Percentile
14.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0023 is in the 14th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
swiftpatch availablevia ghsa
Product: leaf-kitFixed in: 1.4.1
swiftpatch availablevia ghsa
Product: github.com/vapor/leaf-kitFixed in: 1.4.1

Vendor Advisories (1)

swiftGHSA-4hfh-fch3-5q7pmedium

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

Feb 19, 2026

References

github.com / vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34
Patch
github.com / vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7p
ExploitVendor Advisory