What is CVE-2026-56761?

CVE-2026-56761 is a medium-severity vulnerability in Hono, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-06-24.

How severe is CVE-2026-56761?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Hono

CVE-2026-56761

hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attackers to inject unintended html by using malformed attribute names. Attackers can craft specially crafted attribute keys containing c…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (7.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Hono — versions 0, 4.12.14

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory, Vendor Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-56761?: CVE-2026-56761 is a medium-severity vulnerability in Hono, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-06-24.
How severe is CVE-2026-56761?: Medium severity. CVSS v3 base score is 4.3 out of 10.