What is CVE-2026-59804?

CVE-2026-59804 is a medium-severity vulnerability in Web-infra-dev Midscene, classified under Missing Authentication for Critical Function. CVSS score: 6.8/10. Published 2026-07-08.

How severe is CVE-2026-59804?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Web-infra-dev Midscene

CVE-2026-59804

Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-orig…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Web-infra-dev Midscene — versions 0, 86f4118d1d847041c63d79e347e08c87c3f1a882

Weakness classification (CWE)

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-59804?: CVE-2026-59804 is a medium-severity vulnerability in Web-infra-dev Midscene, classified under Missing Authentication for Critical Function. CVSS score: 6.8/10. Published 2026-07-08.
How severe is CVE-2026-59804?: Medium severity. CVSS v3 base score is 6.8 out of 10.