CVE-2026-81528
Last modified
CVE-2026-81528 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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/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
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | C# Driver | >= 2.9.0, < 3.11.1 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-81528?
How severe is CVE-2026-81528?
How do I fix CVE-2026-81528?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-81522A weakness in the MongoDB C++ Driver's handling of caller-su…8.1
- CVE-2026-81523A missing input-validation issue in MongoDB libmongocrypt's …4.4
- CVE-2026-81524A weakness in the MongoDB C Driver allows special elements i…5.4
- CVE-2026-81525The MongoDB client library for PHP does not sufficiently san…8.1
- CVE-2026-81526The MongoDB Rust Driver does not neutralize special characte…6.5
- CVE-2026-81527A NoSQL/expression injection weakness exists in the LINQ-to-…6.5
- CVE-2026-81529Improper neutralization of delimiters in connection-URL cons…7.1
- CVE-2026-8153OS command injection in Dashboard Server interface in Univer…9.8
- CVE-2026-81530A weakness in the client-side encryption configuration surfa…5.6
- CVE-2026-81532A user able to submit SQL through an application using the M…8.8
- CVE-2026-81533An application using the MongoDB BI Connector ODBC Driver ma…7.1
- CVE-2026-8155The BuddyPress WordPress plugin before 14.5.0 does not prope…5.4
Are you affected by CVE-2026-81528?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST