EUVD-2026-56861
GHSA-h22h-g2cf-r8hr
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/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 but requires a trusted certificate plus matching account (PR:L, AC:H); scope unchanged within MongoDB; no availability impact described.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/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
3DescriptionCVE.org
An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow authentication through a method the administrator intended to disable.
AnalysisAI
MongoDB Server 8.3.x through 8.3.7 permits certificate-based authentication to succeed for a client holding a valid x.509 certificate and a corresponding user account, even when the administrator has explicitly configured the server to restrict allowable authentication mechanisms to other methods such as SCRAM. The vulnerability undermines deliberate access-control policy decisions rather than enabling unauthenticated access, meaning the attacker must already possess legitimate credential material. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following conditions simultaneously: (1) the attacker must hold a valid x.509 client certificate that is trusted by the MongoDB server's configured CA trust chain - a self-signed or externally-obtained certificate not in the trust store will not work; (2) a MongoDB user account whose subject DN matches that certificate must exist and not be disabled in the target database; and (3) the administrator must have explicitly configured the server to restrict authentication mechanisms away from x.509 (i.e., the bypass only matters when a restriction is in place). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | All available signals converge on a genuinely low real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A former employee or a service whose certificate has been operationally deprecated - but whose x.509 certificate has not yet been revoked and whose MongoDB user account remains active - connects to a MongoDB 8.3.x server over TLS, presenting the certificate during the handshake. Despite the administrator having restricted the server to SCRAM-only authentication, the server accepts the certificate-based login and grants the attacker access with the privileges of the associated account. … |
| Remediation | Upgrade MongoDB Server to version 8.3.8 or later, which contains the vendor-released patch per JIRA ticket SERVER-127863 (https://jira.mongodb.org/browse/SERVER-127863); the fix boundary of 8.3.8 is confirmed by the EUVD-2026-56861 affected-version range. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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