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CVE-2026-59895

MEDIUM
6.1
CVSS 3.1
Description
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class attribute during server-side rendering to break out of the attribute and inject arbitrary markup. This issue is fixed in version 4.12.27.

Metadata

CVE ID
CVE-2026-59895
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-07 16:40 UTC
Published
2026-07-08 16:09 UTC
Last updated
2026-07-08 19:41 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
honojs / hono
Sources
cve.org  ·  NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
honojs hono — >= 4.0.0, < 4.12.27
Weakness (CWE)
CWESourceDescription
CWE-116 cna CWE-116: Improper Encoding or Escaping of Output
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.1 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References (3)
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