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P4
CVE-2026-70554: MaxSite CMS 0.78 through 109.5
CVE-2026-70554. CVSS 3.1 base score 9.8 (CRITICAL, Vendor/CNA). EPSS 0.01233 (percentile 0.68767), scored 22-Oct-2026.
Affected technology
MaxSite CMS · 0.78 through 109.5
MaxSite
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required
What an attacker can do
Unauthenticated attackers can execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Vendor/CNA’s CVSS 4.0 assessment (base score 9.3/10) rates confidentiality, integrity and availability impact as high.
- CWE
- CWE-502
- CCR priority
- 39.5 /100 (P4)
- CVSS 3.1
- 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · Vendor/CNA
- EPSS
- 0.01233 · percentile 0.68767 · 2026-10-22
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-24 01:40:49.068977+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-70554.html