CVE-2026-81528
published 2026-08-27CVE-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…
PriorityP432medium5.4CVSS 3.1
AVNACLPRLUINSUCLILAN
EPSS
0.28%
19.4th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mongodb | c_driver | >= 2.10.0 < 3.11.1 | 3.11.1 |
| mongodb | c_driver | >= 2.9.0 < 3.11.1 | 3.11.1 |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
nvdv4.05.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/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
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GHSA
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 withou
ghsa_unreviewed·2026-08-27
CVE-2026-81528 [MEDIUM] CWE-943 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 withou
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.
VulDB
MongoDB C# Driver up to 3.11.0 Document Replacement neutralization
vuldb·2026-08-27·CVSS 5.4
CVE-2026-81528 [MEDIUM] MongoDB C# Driver up to 3.11.0 Document Replacement neutralization
A vulnerability, which was classified as critical, has been found in MongoDB C# Driver up to 3.11.0. Affected by this issue is some unknown functionality of the component Document Replacement. This manipulation causes improper neutralization.
This vulnerability is tracked as CVE-2026-81528. The attack is possible to be carried out remotely. No exploit exists.
It is advisable to upgrade the affected component.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-08-27
Published