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MacCMS Pro CVE-2026-15516

| EUVDEUVD-2026-43258 LOW
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-07-13 VulDB GHSA-r7c2-xcmm-m4pr
Authentication Bypass PHP Maccms Pro
2.9
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.9 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
5.6 MEDIUM

Network-accessible install endpoint requires no auth (PR:N), but AC:H reflects stated high exploit complexity; partial CIA impacts match CWE-639 scope, no scope change applies.

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

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Severity Changed
Jul 13, 2026 - 01:22 NVD
MEDIUM LOW
CVSS changed
Jul 13, 2026 - 01:22 NVD
6.3 (MEDIUM) 2.9 (LOW)
Analysis Generated
Jul 13, 2026 - 00:46 vuln.today

DescriptionCVE.org

A vulnerability was detected in MacCMS Pro up to 2022.1000.3005. Impacted is the function step5 of the file application/install/controller/Index.php of the component Installation Module. The manipulation results in authorization bypass. The attack may be launched remotely. The attack requires a high level of complexity. The exploitability is considered difficult. The exploit is now public and may be used. Upgrading to version 2022.1000.3025 is recommended to address this issue. Upgrading the affected component is recommended.

AnalysisAI

Authorization bypass in MacCMS Pro's installation module allows remote attackers to circumvent access controls via the step5 function in the installation controller, affecting all versions through 2022.1000.3005. Exploitation is rated high-complexity (AC:H), limiting opportunistic mass exploitation, though a public proof-of-concept is available on GitHub. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed MacCMS Pro install endpoint
Delivery
Craft manipulated step5 HTTP request with controlled key value
Exploit
Bypass CWE-639 authorization check in Index.php
Execution
Execute unauthorized installation operations
Impact
Achieve partial confidentiality, integrity, and availability impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the MacCMS Pro installation module (`application/install/controller/Index.php`) remains accessible over the network - this is the primary gating condition, as many deployments leave the install directory exposed after initial setup. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.3 reflects a medium-severity issue driven by AV:N (network-reachable), PR:N (no authentication), but tempered by AC:H (high attack complexity) and limited CIA impacts (VC:L/VI:L/VA:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies a MacCMS Pro installation where the install endpoint remains publicly accessible post-deployment. Using the publicly available POC at https://github.com/trustbigcat/CVE/, the attacker crafts a specially manipulated HTTP request targeting the `step5` function with a user-controlled key value that bypasses the authorization check, allowing them to execute installation steps without legitimate authorization and achieve partial confidentiality, integrity, and availability impact on the vulnerable system.
Remediation Upgrade MacCMS Pro to version 2022.1000.3025 or later, available at https://github.com/magicblack/maccms10/releases (page 3 of releases). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-15516 vulnerability details – vuln.today
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