MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can craft a malicious serialized PHP object payload delivered in a single HTTP request to trigger magic methods during object graph reconstruction, enabling property-oriented programming attacks or remote code execution via available gadget chains such as those targeting SoapClient or Imagick extensions.
Metrics
Affected Vendors & Products
References
History
Fri, 14 Aug 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Max-3000
Max-3000 maxsite Cms |
|
| CPEs | cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Max-3000
Max-3000 maxsite Cms |
Wed, 05 Aug 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Tue, 04 Aug 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Maxsite
Maxsite maxsite Cms |
|
| Vendors & Products |
Maxsite
Maxsite maxsite Cms |
Tue, 04 Aug 2026 20:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can craft a malicious serialized PHP object payload delivered in a single HTTP request to trigger magic methods during object graph reconstruction, enabling property-oriented programming attacks or remote code execution via available gadget chains such as those targeting SoapClient or Imagick extensions. | |
| Title | MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie | |
| Weaknesses | CWE-502 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-08-04T20:11:55.735Z
Updated: 2026-08-14T16:51:28.249Z
Reserved: 2026-08-04T19:19:05.906Z
Link: CVE-2026-70554
Updated: 2026-08-05T13:52:53.132Z
Status : Received
Published: 2026-08-04T21:16:38.613
Modified: 2026-08-05T15:17:13.783
Link: CVE-2026-70554
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