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Pagekit CMS CVE-2026-57518

| EUVDEUVD-2026-39795 HIGH
Missing Authorization (CWE-862)
2026-06-26 VulnCheck GHSA-rc6m-346q-rgq6
Authentication Bypass RCE Privilege Escalation PHP Pagekit
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
vuln.today AI
9.9 CRITICAL

Network endpoint with low-privileged authenticated account (PR:L) and no interaction; authorization bypass crosses a privilege boundary to RCE (S:C) with full C/I/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jun 26, 2026 - 17:21 vuln.today

DescriptionCVE.org

Pagekit CMS 1.0.18 contains a privilege escalation vulnerability that allows authenticated users with the 'user: manage users' permission to escalate privileges by assigning arbitrary custom roles to themselves due to missing authorization checks in UserApiController::saveAction(). Attackers can assign themselves a custom role with the 'system: manage packages' permission and then upload and install a malicious PHP package through the admin package installer to achieve remote code execution.

Articles & Coverage 1

News 8 New PHP Vulnerabilities - 2 Critical, 6 High, 1 With POC Jun 27, 2026

AnalysisAI

Privilege escalation to remote code execution in Pagekit CMS 1.0.18 lets an authenticated user holding the 'user: manage users' permission grant themselves arbitrary custom roles via an unprotected UserApiController::saveAction(), then assign a role carrying 'system: manage packages' to upload a malicious PHP package through the admin installer and run arbitrary code. Publicly available exploit code exists (gist by sermikr0, reported by VulnCheck), and the chain converts a limited management permission into full server compromise. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with 'user: manage users' account
Delivery
POST to UserApiController::saveAction()
Exploit
Self-assign role with 'system: manage packages'
Execution
Upload malicious PHP package via admin installer
Persist
Install package to execute code
Impact
Remote code execution on server
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated Pagekit CMS 1.0.18 account that already holds the 'user: manage users' permission (PR:L), and a custom role carrying 'system: manage packages' must exist or be creatable for self-assignment; the final RCE step depends on the admin package installer being available to install attacker-supplied PHP packages. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H, score 8.7) is internally consistent with the description: network-reachable, low complexity, requires low privileges (an existing authenticated account with 'user: manage users'), no user interaction, and full confidentiality/integrity/availability impact via RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker controlling a low-trust Pagekit account that was delegated the 'user: manage users' permission (e.g., a support or content-team operator) issues an API request to UserApiController::saveAction() assigning their own account a custom role that includes 'system: manage packages'. With that elevated capability, they upload a crafted PHP package through the admin package installer, which executes on installation to yield remote code execution on the server. …
Remediation No vendor-released patch version was identified at time of analysis, so apply compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 HOURS: Restrict administrative access to Pagekit 1.0.18 admin consoles; audit all administrative accounts and their permissions; disable package management features if operationally feasible; review access logs for suspicious activity. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-57518 vulnerability details – vuln.today
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