Vulnerability Details CVE-2026-81528
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.5%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-81528
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cpe:2.3:a:mongodb:c#_driver:2.10.0
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cpe:2.3:a:mongodb:c#_driver:2.10.1
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cpe:2.3:a:mongodb:c#_driver:2.10.2
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cpe:2.3:a:mongodb:c#_driver:2.10.3
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cpe:2.3:a:mongodb:c#_driver:2.10.4
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cpe:2.3:a:mongodb:c#_driver:2.11.0
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cpe:2.3:a:mongodb:c#_driver:2.11.1
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cpe:2.3:a:mongodb:c#_driver:2.11.2
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cpe:2.3:a:mongodb:c#_driver:2.11.3
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cpe:2.3:a:mongodb:c#_driver:2.11.4
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cpe:2.3:a:mongodb:c#_driver:2.11.5
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cpe:2.3:a:mongodb:c#_driver:2.11.6
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cpe:2.3:a:mongodb:c#_driver:2.12.0
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cpe:2.3:a:mongodb:c#_driver:2.12.1
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cpe:2.3:a:mongodb:c#_driver:2.12.2
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cpe:2.3:a:mongodb:c#_driver:2.12.3
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cpe:2.3:a:mongodb:c#_driver:2.13.0
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cpe:2.3:a:mongodb:c#_driver:2.13.1
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cpe:2.3:a:mongodb:c#_driver:2.13.2
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cpe:2.3:a:mongodb:c#_driver:2.13.3
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cpe:2.3:a:mongodb:c#_driver:2.14.0
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cpe:2.3:a:mongodb:c#_driver:2.14.1
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cpe:2.3:a:mongodb:c#_driver:2.15.0
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cpe:2.3:a:mongodb:c#_driver:2.15.1
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cpe:2.3:a:mongodb:c#_driver:2.16.0
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cpe:2.3:a:mongodb:c#_driver:2.16.1
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cpe:2.3:a:mongodb:c#_driver:2.17.0
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cpe:2.3:a:mongodb:c#_driver:2.17.1
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cpe:2.3:a:mongodb:c#_driver:2.18.0
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cpe:2.3:a:mongodb:c#_driver:2.19.0
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cpe:2.3:a:mongodb:c#_driver:2.20.0
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cpe:2.3:a:mongodb:c#_driver:2.21.0
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cpe:2.3:a:mongodb:c#_driver:2.22.0
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cpe:2.3:a:mongodb:c#_driver:2.23.0
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cpe:2.3:a:mongodb:c#_driver:2.23.1
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cpe:2.3:a:mongodb:c#_driver:2.23.2
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cpe:2.3:a:mongodb:c#_driver:2.24.0
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cpe:2.3:a:mongodb:c#_driver:2.25.0
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cpe:2.3:a:mongodb:c#_driver:2.26.0
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cpe:2.3:a:mongodb:c#_driver:2.27.0
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cpe:2.3:a:mongodb:c#_driver:2.28.0
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cpe:2.3:a:mongodb:c#_driver:2.29.0
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cpe:2.3:a:mongodb:c#_driver:2.30.0
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cpe:2.3:a:mongodb:c#_driver:3.0.0
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cpe:2.3:a:mongodb:c#_driver:3.1.0
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cpe:2.3:a:mongodb:c#_driver:3.10.0
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cpe:2.3:a:mongodb:c#_driver:3.11.0
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cpe:2.3:a:mongodb:c#_driver:3.2.0
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cpe:2.3:a:mongodb:c#_driver:3.2.1
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cpe:2.3:a:mongodb:c#_driver:3.3.0
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cpe:2.3:a:mongodb:c#_driver:3.4.0
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cpe:2.3:a:mongodb:c#_driver:3.4.1
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cpe:2.3:a:mongodb:c#_driver:3.4.2
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cpe:2.3:a:mongodb:c#_driver:3.4.3
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cpe:2.3:a:mongodb:c#_driver:3.5.0
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cpe:2.3:a:mongodb:c#_driver:3.5.1
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cpe:2.3:a:mongodb:c#_driver:3.5.2
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cpe:2.3:a:mongodb:c#_driver:3.6.0
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cpe:2.3:a:mongodb:c#_driver:3.7.0
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cpe:2.3:a:mongodb:c#_driver:3.7.1
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cpe:2.3:a:mongodb:c#_driver:3.8.0
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cpe:2.3:a:mongodb:c#_driver:3.8.1
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cpe:2.3:a:mongodb:c#_driver:3.9.0