CVE-2026-81528 - NoSQL injection via array replacement bypassing update shape validation in driver write path
Brief
CVE ID : CVE-2026-81528
Published : Aug. 27, 2026, 8:18 p. m.
- 55 minutes ago
Description : A MongoDB C# driver document-replacement code path omits the element-name/shape validation that the equivalent write paths apply, so a value supplied as a replacement is forwarded to the server without neutralization of query-language special elements.
An application that passes untrusted, loosely-typed input as a replacement value therefore allows that input to be interpreted by the database as update logic rather than as data, executing under the application's own database credentials. Applications using strongly-typed document mappings are not affected.
Severity: 5.4
- MEDIUM
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