Is CVE-2026-54290 actively exploited?

No active exploitation of CVE-2026-54290 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54290 be exploited remotely?

Yes. CVE-2026-54290 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54290?

CVE-2026-54290 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-54290

CWE-942Published: June 22, 2026· Updated: Jun 22, 2026

7.1

CVSS v3.1

EPSS:0.25%probability of exploitation in 30 daysPercentile:15.8th

Official Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, with credentials: true and no explicit origin (the default wildcard), the CORS Middleware reflects the request's Origin and sends Access-Control-Allow-Credentials: true. Any site can then make credentialed cross-origin requests and read the responses, exposing cookie-authenticated endpoints to arbitrary origins. This vulnerability is fixed in 4.12.25.

NVD Source

Technical Analysis

CVE-2026-54290 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.1.