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.

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Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title NoSQL injection via array replacement bypassing update shape validation in driver write path
Weaknesses CWE-943
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-08-27T22:34:51.114Z

Reserved: 2026-08-26T22:14:24.585Z

Link: CVE-2026-81528

cve-icon Vulnrichment

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cve-icon NVD

Status : Received

Published: 2026-08-27T20:18:51.340

Modified: 2026-08-28T00:18:21.277

Link: CVE-2026-81528

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses