EUVD-2026-40949
GHSA-h63w-8j45-g3cx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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
Network-reachable IDOR requiring authentication (PR:L); impact is limited to confidentiality of documents with no integrity or availability consequence and no scope change.
Primary rating from Vendor (CERT-PL).
CVSS VectorVendor: CERT-PL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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
Lifecycle Timeline
2DescriptionCVE.org
MCO is vulnerable to an Insecure Direct Object Reference (IDOR) vulnerability in the /customer/servlet/mco/webapi/trading-document/fetchPdfStatement endpoint. The application does not properly validate whether an authenticated user is authorized to access a requested document, allowing direct retrieval based on a user-supplied identifier. An attacker can access trading documents belonging to other users by providing a valid document ID. Although exploitation requires guessing the identifier, predictable ID patterns enable feasible enumeration, leading to unauthorized disclosure of sensitive information.
Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 25.3.3.1 but may also affect other versions.
AnalysisAI
Insecure Direct Object Reference in MyComplianceOffice MCO version 25.3.3.1 allows authenticated users to retrieve trading document PDFs belonging to other customers by manipulating a user-supplied document identifier at the fetchPdfStatement API endpoint. The application performs no ownership or authorization check beyond confirming the user is logged in, enabling horizontal privilege escalation across customer accounts. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated MCO session - the CVSS 4.0 vector specifies PR:L (low privilege), confirming that unauthenticated access is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) scores 5.3 (Medium), reflecting network accessibility, low complexity, required authentication, and limited confidentiality impact with no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with a valid MCO login - such as a client user, insider, or holder of a compromised credential - sends authenticated HTTP requests to the fetchPdfStatement endpoint, iterating over predictable document IDs. Because the application returns the requested PDF without checking that the ID belongs to the requesting user's account, the attacker systematically downloads trading statements from other customers. … |
| Remediation | No vendor-released patch has been identified at time of analysis - vendor contact attempts by CERT-PL were unsuccessful. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
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External POC / Exploit Code
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