CVE-2026-81527 Vulnerability Analysis & Exploit Details

CVE-2026-81527
Vulnerability Scoring

6.5
/10
High Risk

If left unpatched, CVE-2026-81527 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-81527 Details

Status: Analyzed

Last updated: 🕖 29 Sep 2026, 19:16 UTC
Originally published on: 🕗 27 Aug 2026, 20:18 UTC

Time between publication and last update: 32 days

CVSS Release: version 3

CVSS3 Source

cna@mongodb.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVE-2026-81527 Vulnerability Summary

CVE-2026-81527: A NoSQL/expression injection weakness exists in the LINQ-to-aggregation query translation layer of the MongoDB C# Driver, in both aggregation expression and query filter translation. When application-supplied values are embedded in certain query constructs, special elements contained within those values are not properly escaped before the resulting query is transmitted to the database, so portions of the value may be interpreted by the database as query logic rather than as data. A user able to supply values that an application incorporates into an affected query may thereby cause unintended data to be returned or query results to be altered.

Assessing the Risk of CVE-2026-81527

Access Complexity Graph

The exploitability of CVE-2026-81527 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-81527

With low attack complexity and no required privileges, CVE-2026-81527 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-81527, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-81527, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-81527 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2026-81527 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-81527 does not impact system availability.

CVE-2026-81527 References

External References

CWE Common Weakness Enumeration

CWE-943

CAPEC Common Attack Pattern Enumeration and Classification

  • NoSQL Injection CAPEC-676 An adversary targets software that constructs NoSQL statements based on user input or with parameters vulnerable to operator replacement in order to achieve a variety of technical impacts such as escalating privileges, bypassing authentication, and/or executing code.

Vulnerable Configurations

  • cpe:2.3:a:mongodb:c\#_driver:2.10.0:-:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.0:-:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.10.0:beta1:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.0:beta1:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.10.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.10.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.10.3:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.3:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.10.4:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.10.4:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.0:-:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.0:-:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.0:beta1:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.0:beta1:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.0:beta2:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.0:beta2:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.3:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.3:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.4:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.4:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.5:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.5:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.11.6:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.11.6:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.12.0:-:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.12.0:-:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.12.0:beta1:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.12.0:beta1:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.12.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.12.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.12.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.12.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.12.3:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.12.3:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.13.0:beta1:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.13.0:beta1:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.13.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.13.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.13.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.13.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.13.3:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.13.3:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.14.0:-:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.14.0:-:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.14.0:beta1:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.14.0:beta1:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.14.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.14.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.15.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.15.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.15.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.15.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.16.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.16.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.16.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.16.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.17.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.17.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.17.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.17.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.18.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.18.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.19.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.19.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.20.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.20.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.21.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.21.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.22.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.22.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.23.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.23.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.23.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.23.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.23.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.23.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.24.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.24.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.25.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.25.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.26.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.26.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.27.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.27.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.28.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.28.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.29.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.29.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:2.30.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:2.30.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.0.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.0.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.1.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.1.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.2.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.2.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.2.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.2.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.3.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.3.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.4.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.4.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.4.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.4.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.4.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.4.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.4.3:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.4.3:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.5.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.5.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.5.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.5.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.5.2:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.5.2:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.6.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.6.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.7.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.7.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.7.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.7.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.8.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.8.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.8.1:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.8.1:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.9.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.9.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.10.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.10.0:*:*:*:*:mongodb:*:*
  • cpe:2.3:a:mongodb:c\#_driver:3.11.0:*:*:*:*:mongodb:*:*
    cpe:2.3:a:mongodb:c\#_driver:3.11.0:*:*:*:*:mongodb:*:*

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