EUVD-2026-75111
GHSA-x43r-8q5x-82p8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/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
Publicly known hardcoded key lets an unauthenticated remote attacker forge admin sessions with no interaction, yielding full admin control over the CMS (C/I/A:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.
Articles & Coverage 1
AnalysisAI
Authentication bypass in MaxSite CMS versions 0.78 through 109.6 lets unauthenticated remote attackers forge valid administrator session cookies because the framework ships with a hardcoded session encryption key in application/config/config.php that installers never rotate. Using the publicly known key, an attacker computes a valid HMAC-SHA1 over a crafted ci_session cookie to impersonate an admin, defeating the is_login() and mso_check_allow() authorization checks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only that the target runs a default/unmodified MaxSite CMS (0.78 through 109.6) whose administrator has not manually changed the encryption key in application/config/config.php - which the installer never prompts for, so default deployments are vulnerable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue. … 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 vendor-released patched version is identified in the available data, so the primary compensating control is to immediately replace the hardcoded session encryption key in application/config/config.php with a unique, high-entropy random value on every installation (this invalidates all existing sessions, forcing users to re-authenticate - an acceptable trade-off). … Detailed patch versions, workarounds, and compensating controls in full report. |
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No vendor-released patch identified at time of analysis. …
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Same weakness CWE-321 – Use of Hard-coded Cryptographic Key
View allSame technique Authentication Bypass
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External POC / Exploit Code
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