Overly permissive cross-domain whitelist in hono - CVE-2026-54290
Published: July 21, 2026
Vulnerability identifier: #VU138950
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-54290
CWE-ID: CWE-942
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Hono
Affected software:
hono
hono
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass the CORS protection mechanism.
The vulnerability exists due to incorrect processing of the "Origin" HTTP header that is supplied within HTTP request. A remote attacker can supply arbitrary value via the "Origin" HTTP header, bypass implemented CORS protection mechanism and perform cross-site scripting attacks against the vulnerable application.
How to mitigate CVE-2026-54290
Install updates from vendor's website.