Summary
CVE-2026-88414 describes a SQL injection vulnerability (CWE-89) affecting MCMS versions 6.1.1 through 6.2.1. The vulnerability resides in the PageAction.verify endpoint, accessible via GET /ms/mdiy/page/verify.do. With a CVSS 3.1 base score of 9.8 (Critical), the vulnerability is network-exploitable, requires no privileges, requires no user interaction, and results in full impact to confidentiality, integrity, and availability. This makes it one of the most severe classes of web application vulnerabilities, as an unauthenticated remote attacker can potentially execute arbitrary SQL commands against the backend database.
Technical Analysis
The vulnerability is classified under CWE-89, which covers improper neutralization of special elements used in an SQL command. In this case, the PageAction.verify endpoint in MCMS accepts user-supplied input that is incorporated into SQL queries without adequate sanitization or parameterization.
MCMS is a content management system (CMS) that provides page management and template rendering functionality. The /ms/mdiy/page/verify.do endpoint is part of the ms/mdiy module, which handles DIY (do-it-yourself) page-related operations. The verify action within PageAction is designed to perform some form of validation or verification on page-related data, but the implementation fails to properly sanitize input before constructing database queries.
The CVSS vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:
- Attack Vector (AV:N): Network — the vulnerability is exploitable over the network, meaning any reachable instance is potentially at risk.
- Attack Complexity (AC:L): Low — exploitation does not require special conditions or complex preparations.
- Privileges Required (PR:N): None — no authentication is needed to reach and exploit the vulnerable endpoint.
- User Interaction (UI:N): None — the attack does not require any action from a victim user.
- Scope (S:U): Unchanged — the impact is confined to the vulnerable component's security authority.
- Confidentiality (C:H): High — an attacker can access sensitive data stored in the database.
- Integrity (I:H): High — an attacker can modify or delete database records.
- Availability (A:H): High — an attacker can disrupt service by corrupting or dropping database tables.
The combination of no authentication required and full CIA impact makes this vulnerability particularly dangerous. The endpoint /ms/mdiy/page/verify.do appears to be publicly accessible without requiring a session or authentication token, which means any internet-facing MCMS deployment running an affected version is immediately at risk.
SQL injection vulnerabilities in CMS platforms are especially concerning because these systems typically store sensitive information including user credentials, content metadata, configuration data, and potentially customer or business data. A successful exploitation could allow an attacker to extract all database contents, modify pages served to visitors, create administrative accounts, or destroy data entirely.
The fact that the vulnerability spans multiple versions (6.1.1 through 6.2.1) suggests that the vulnerable code pattern was introduced in version 6.1.1 and persisted through subsequent releases up to and including 6.2.1. This indicates that the issue was not caught during development or testing across several release cycles.
Affected Software and Versions
Based on the provided NVD data, the affected software and versions are as follows:
- Product: MCMS
- Affected Versions: 6.1.1 through 6.2.1 (inclusive)
- Vulnerable Endpoint:
GET /ms/mdiy/page/verify.do(PageAction.verify)
The NVD data does not specify a vendor name or a specific patched version. Details about whether a fix has been released in a version newer than 6.2.1 are not fully disclosed in the provided data. Organizations running MCMS versions within the affected range should treat this vulnerability as critical and prioritize remediation.
It is important to note that the NVD entry does not provide information about versions prior to 6.1.1. It is possible that earlier versions are also affected, but this cannot be confirmed from the available data. Similarly, the data does not specify whether version 6.2.2 or later contains a patch.
Impact
The impact of CVE-2026-88414 is severe across all three security objectives:
Confidentiality (High): An attacker can use SQL injection techniques such as UNION-based queries, boolean-based blind injection, or time-based blind injection to extract data from the database. This could include user credentials, personal information, application configuration, business data, and any other information stored in the database. In a CMS context, this might expose content management accounts, customer data, and internal application settings.
Integrity (High): SQL injection allows an attacker to modify existing database records. In the context of MCMS, an attacker could alter page content, modify user permissions, change configuration settings, or inject malicious content into pages served to site visitors. This could be used for defacement, phishing, or supply-chain style attacks where visitors to the CMS-powered site are served malicious content.
Availability (High): An attacker can execute destructive SQL commands such as DROP TABLE, DELETE, or resource-intensive queries that can crash the database or make the application unresponsive. This could result in complete service disruption for any site powered by the affected MCMS instance.
The unauthenticated nature of the vulnerability means that an attacker does not need valid credentials or any prior access to the system. Combined with the network attack vector, this means any internet-facing MCMS instance running an affected version can be attacked by anyone who can reach the server.
Exploitation Scenario
The following scenario is illustrative and derived from the vulnerability description. It is intended to help security professionals understand the potential attack flow.
An attacker identifies an internet-facing MCMS deployment running version 6.1.1 through 6.2.1. The attacker discovers the /ms/mdiy/page/verify.do endpoint, which is accessible without authentication. By sending crafted HTTP GET requests to this endpoint with SQL injection payloads appended to or embedded within the request parameters, the attacker can manipulate the backend SQL query.
For example, the attacker might begin with reconnaissance by sending a simple payload that causes a database error or a measurable time delay, confirming that the endpoint is vulnerable to SQL injection. Once confirmed, the attacker could escalate to extracting database schema information, enumerating tables and columns, and ultimately extracting sensitive data such as administrator credentials or user records.
With extracted credentials, the attacker could authenticate to the MCMS administrative interface and gain full control over the content management system. Alternatively, the attacker could use the SQL injection to directly modify page content, insert new administrative users, or corrupt the database to cause a denial of service.
Because the endpoint uses the HTTP GET method, the attack could potentially be executed through a simple URL, making it possible to exploit via a browser, a command-line tool like curl, or even by tricking a victim into clicking a crafted link (though the CVSS vector indicates user interaction is not required for exploitation).
Detection and Mitigation
Detection:
Organizations should monitor web server and application logs for requests to /ms/mdiy/page/verify.do that contain suspicious characters or patterns commonly associated with SQL injection, such as single quotes, double quotes, semicolons, SQL keywords (UNION, SELECT, INSERT, UPDATE, DELETE, DROP), comment sequences (--, /*, */), and encoding anomalies that might indicate obfuscated payloads.
Web Application Firewall (WAF) rules can be configured to detect and block SQL injection attempts targeting this specific endpoint. Database monitoring tools may also detect anomalous queries originating from the MCMS application, particularly queries that include unexpected syntax or access unusual tables.
Network-level indicators include unexpected GET requests to the /ms/mdiy/page/verify.do path from external IP addresses, especially those containing long query strings or unusual parameter values.
Mitigation:
- Upgrade: If a patched version of MCMS is available (later than 6.2.1), upgrade immediately. The NVD data does not confirm a specific patched version, so organizations should check with the MCMS project for the latest release information.
- Access Control: Restrict access to the
/ms/mdiy/page/verify.doendpoint at the network level if it does not need to be publicly accessible. This can be done using reverse proxy rules, firewall rules, or application-level IP allowlisting. - WAF Rules: Deploy or configure WAF rules to block SQL injection patterns targeting the vulnerable endpoint. While this is a compensating control and not a replacement for patching, it can provide temporary protection.
- Input Validation: If the source code is available and can be modified, ensure that all input to the
PageAction.verifyendpoint is properly validated and that SQL queries use parameterized queries or prepared statements instead of string concatenation. - Database Permissions: Apply the principle of least privilege to the database account used by MCMS. Restrict the account to only the operations it needs (ideally SELECT for verification operations) and limit access to sensitive tables.
Bug Bounty Angle
For bug bounty hunters and offensive security researchers, CVE-2026-88414 presents several interesting angles:
Target Identification: MCMS deployments can be identified through fingerprinting techniques such as analyzing HTTP response headers, page content patterns, favicon hashes, and known URL paths associated with MCMS. The /ms/mdiy/ path segment is a distinctive indicator that can be used to confirm the presence of MCMS.
Exploitation Approach: The vulnerability is in a GET endpoint, which simplifies testing. Researchers should focus on identifying the specific parameters accepted by /ms/mdiy/page/verify.do and testing each for SQL injection. Common techniques include error-based injection (looking for database error messages in responses), boolean-based blind injection (comparing responses for true/false conditions), time-based blind injection (using SLEEP or BENCHMARK functions to measure response delays), and UNION-based injection (if the query structure allows it).
Version Confirmation: Since the vulnerability affects versions 6.1.1 through 6.2.1, researchers should confirm the target version before reporting. Version information may be available in HTTP headers, footer text, API responses, or configuration endpoints.
Reporting Considerations: When reporting this vulnerability in a bug bounty context, include clear evidence of the injection point, the specific parameter affected, the SQL injection technique used, and the data accessible through exploitation. Avoid extracting sensitive data unnecessarily — demonstrating the ability to read database metadata or version information is often sufficient to prove the vulnerability.
Related Attack Surface: Researchers who find this vulnerability should also investigate other endpoints within the /ms/mdiy/ module and the broader MCMS application. SQL injection vulnerabilities often exist in multiple locations within the same codebase due to shared coding patterns. Additionally, the verify action may be one of several actions in PageAction that share similar vulnerable code patterns.
Automation: The GET-based nature of this vulnerability makes it suitable for automated scanning. Researchers can incorporate checks for this endpoint into their reconnaissance workflows using tools like Nuclei, custom Python scripts, or Burp Suite extensions. However, always ensure that automated testing is authorized and does not cause unintended damage to the target system.
Frequently Asked Questions
What is CVE-2026-88414?
CVE-2026-88414 is a critical SQL injection vulnerability (CWE-89) in MCMS versions 6.1.1 through 6.2.1, specifically in the PageAction.verify endpoint at GET /ms/mdiy/page/verify.do. It has a CVSS score of 9.8 and requires no authentication to exploit.
Which versions of MCMS are affected by CVE-2026-88414?
MCMS versions 6.1.1 through 6.2.1 (inclusive) are affected by this vulnerability. The NVD data does not specify whether versions prior to 6.1.1 or versions after 6.2.1 are affected or patched.
Is authentication required to exploit CVE-2026-88414?
No. The CVSS vector indicates PR:N (Privileges Required: None), meaning the vulnerable endpoint /ms/mdiy/page/verify.do can be accessed and exploited without any authentication credentials.
What is the CVSS score for CVE-2026-88414?
The CVSS 3.1 base score is 9.8 (Critical), with the vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating full impact to confidentiality, integrity, and availability with no authentication or user interaction required.
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