CVE-2026-19357 Overview
CVE-2026-19357 is an information disclosure vulnerability in MingSoft MCMS versions up to 3.0.6. The flaw resides in an unknown function of the file /mdiy/form/get within the ms-mdiy component. Attackers can manipulate the endpoint remotely to obtain sensitive information without authentication or user interaction. The exploit has been publicly released and may be leveraged in opportunistic attacks. The vendor was contacted before public disclosure but did not respond, meaning no coordinated patch is currently available.
Critical Impact
Unauthenticated remote attackers can retrieve sensitive information from vulnerable MingSoft MCMS instances by targeting the /mdiy/form/get endpoint, with public exploit code available and no vendor response.
Affected Products
- MingSoft MCMS versions up to and including 3.0.6
- The ms-mdiy component containing the /mdiy/form/get endpoint
- Deployments exposing MCMS admin or form-handling routes to untrusted networks
Discovery Timeline
- 2026-08-09 - CVE-2026-19357 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-19357
Vulnerability Analysis
The vulnerability is classified under [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor. The flaw sits in the ms-mdiy component of MingSoft MCMS, specifically in request handling for the /mdiy/form/get route. An attacker manipulates request parameters to trigger the disclosure path, which returns data that should be restricted. Because the attack vector is Network with no privileges or user interaction required, remote unauthenticated exploitation is possible. Public exploit information is available through VulDB, increasing the likelihood of automated scanning and opportunistic use. The vendor was contacted early about this disclosure but did not respond, so defenders should assume no official fix exists at this time.
Root Cause
The root cause is missing or insufficient authorization enforcement on the /mdiy/form/get handler within the ms-mdiy module. The endpoint returns form data or related metadata without validating that the requester is entitled to read it. This class of flaw commonly stems from relying on UI-level controls rather than server-side access checks on data-retrieval endpoints.
Attack Vector
An attacker sends a crafted HTTP request directly to /mdiy/form/get on a reachable MCMS instance. No credentials, tokens, or prior interaction with the application are required. The response leaks information the application should protect. See the CVE-2026-19357 details on VulDB and the VulDB vulnerability record #387211 for further technical context.
Detection Methods for CVE-2026-19357
Indicators of Compromise
- HTTP GET or POST requests to /mdiy/form/get originating from external or unexpected internal sources
- Repeated access to the ms-mdiy component paths from a single client within a short interval, consistent with enumeration
- Anomalous 200-OK responses to /mdiy/form/get requests lacking a valid authenticated session cookie
Detection Strategies
- Deploy web server or WAF rules that log all requests to /mdiy/form/get and alert when the source is unauthenticated
- Baseline normal access patterns for the ms-mdiy component and flag deviations in request volume or user-agent diversity
- Correlate application logs with network telemetry to identify scanning that pairs /mdiy/form/get probes with other MCMS endpoints
Monitoring Recommendations
- Forward MCMS access logs and WAF events to a centralized logging or SIEM platform for retention and correlation
- Alert on outbound data transfers from the MCMS host that follow inbound requests to /mdiy/form/get
- Monitor threat intelligence sources such as VulDB for updates on active exploitation of CVE-2026-19357
How to Mitigate CVE-2026-19357
Immediate Actions Required
- Restrict network access to MCMS administrative and ms-mdiy endpoints to trusted IP ranges or VPN users only
- Place vulnerable MCMS deployments behind a WAF and block or challenge unauthenticated requests to /mdiy/form/get
- Inventory internet-exposed MingSoft MCMS instances and confirm which are running versions up to 3.0.6
Patch Information
No official vendor patch has been published. The vendor was contacted early about this disclosure but did not respond. Track the VulDB entry for CVE-2026-19357 for updates, and consider migrating away from MingSoft MCMS if a fix does not materialize within an acceptable exposure window.
Workarounds
- Block requests to /mdiy/form/get at the reverse proxy or WAF layer when the requester is not authenticated
- Enforce authentication and authorization checks in front of the ms-mdiy component using an external identity-aware proxy
- Disable or remove the ms-mdiy form module if it is not required by the deployment
- Isolate MCMS servers on a segmented network and log all inbound HTTP traffic for forensic review
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
