What is CVE-2026-70552?

CVE-2026-70552 is a critical-severity vulnerability in Maxsite Cms, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-08-04.

How severe is CVE-2026-70552?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Maxsite Cms

CVE-2026-70552

MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-enc…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Maxsite Cms — versions 0.78, 109.6

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

disclosure@vulncheck.com (product)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-70552?: CVE-2026-70552 is a critical-severity vulnerability in Maxsite Cms, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-08-04.
How severe is CVE-2026-70552?: Critical severity. CVSS v3 base score is 9.8 out of 10.