What is CVE-2026-70553?

CVE-2026-70553 is a critical-severity vulnerability in Maxsite Cms, classified under Code Injection. CVSS score: 9.8/10. Published 2026-08-04.

How severe is CVE-2026-70553?

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

RCE in Maxsite Cms

CVE-2026-70553

MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after install…

Vulnerability class: RCE (Remote Code Execution)

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 105.2, 109.6

Weakness classification (CWE)

CWE-94 — Code Injection

References

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

Frequently asked questions

What is CVE-2026-70553?: CVE-2026-70553 is a critical-severity vulnerability in Maxsite Cms, classified under Code Injection. CVSS score: 9.8/10. Published 2026-08-04.
How severe is CVE-2026-70553?: Critical severity. CVSS v3 base score is 9.8 out of 10.