MongoDBCVE-2026-18703
MongoDB Server: improper authorization
Low2.3CVE-2026-18703 · Published Aug 11, 2026 · updated Sep 16, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| MongoDB Server Product | >= 8.3.0, < 8.3.8 | 8.3.8 |
Details and references
- CVSS 4.0
- 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
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-863
More MongoDB advisories
All MongoDB| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 11 | Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initialization | Medium6.5 | 5.9.2+1 more |
| Aug 11 | MongoDB Server: improper authorization | High7.2 | 8.3.8+2 more |
| Aug 11 | MongoDB Server: use after free | High7.1 | 8.3.8+1 more |
| Aug 11 | MongoDB Server: missing authorization | High7.1 | 8.3.8 |
| Aug 11 | MongoDB Server: untrusted input in a security decision | High7.1 | 8.3.8+2 more |
| Aug 11 | MongoDB Server: use after free | High7.5 | 8.3.8 |