EUVD-2026-75112
GHSA-2phq-cm26-22pm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network object injection (PR:N/UI:N); AC:H because reliable code execution depends on a usable gadget chain being present, with full C/I/A impact when achieved.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
AnalysisAI
PHP object injection in MaxSite CMS through version 109.6 lets unauthenticated remote attackers forge valid ci_session cookies and pass attacker-controlled serialized data to an unrestricted unserialize() call. Because the framework ships a hardcoded encryption key, an attacker can sign forged session cookies that pass integrity checks, instantiate arbitrary PHP objects, and trigger magic methods to corrupt application state or achieve remote code execution when suitable gadget classes are present. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target run MaxSite CMS (0.78 through 109.6) still using the default hardcoded encryption/session key from application/config/config.php - the key is what lets an unauthenticated attacker forge a signed, integrity-valid ci_session cookie. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are consistent and point to a genuine high-priority issue: CVSS 4.0 vector AV:N/AC:L/PR:N/UI:N gives unauthenticated network exploitation with no user interaction, and VC:H/VI:H/VA:H reflects full compromise potential; publicly available exploit code raises real-world exploitability well beyond theoretical. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No fixed version is identified in the available data, so treat this as No vendor-released patch identified at time of analysis and apply compensating controls while monitoring https://github.com/maxsite/cms and the VulnCheck advisory for an update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Immediately isolate all MaxSite CMS instances from production traffic or take them offline; if the application is business-critical, restrict network access to authorized internal users only and audit web server logs for suspicious ci_session cookie activity or evidence of serialized object transmission. …
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External POC / Exploit Code
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