# CVE-2026-82073: MongoDB Server aggregation framework privilege escalation

Source: https://junglewise.ai/threats/cve-2026-82073-mongodb-server-aggregation-framework-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82073 · Severity: medium · CVSS 6.5 · Published 2026-09-08

MongoDB Server is a widely-used document database at the core of many applications' data storage. A security flaw in its aggregation framework allows an authenticated user with limited read permissions to bypass authorization checks and access data they should not be able to reach when Atlas Search is enabled. This could result in unauthorized data exposure for applications relying on view-level access controls to restrict sensitive information.

Technologies: [MongoDB](https://junglewise.ai/threats/technologies/mongodb). Vendors: [MongoDB](https://junglewise.ai/threats/vendors/mongodb).

## Quick answers

**Is CVE-2026-82073 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82073 being exploited in the wild.

**How severe is CVE-2026-82073?** Medium severity, with a CVSS score of 6.5, published 8 September 2026.

**Which products and versions are affected?** MongoDB Server Prior to 9.1.0-rc0, 8.3.9, 9.0.0-rc2, and 9.1.0-rc1024.

**Is there a fix for CVE-2026-82073?** A patch was published on 2026-09-08: Patches released in versions 9.1.0-rc0, 8.3.9, 9.0.0-rc2, and 9.1.0-rc1024 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-82073 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-82073?** Check whether you run MongoDB. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a privilege escalation affecting MongoDB Server's aggregation framework, caused by insufficient validation of the internal $_isHybridSearch parameter. An authenticated attacker can set this parameter at the top level of an aggregation request, causing a security check to be improperly skipped and allowing view-level authorization to be bypassed. The attack requires valid database credentials with at least read access, making it exploitable by insiders or accounts with overly broad permissions. The attacker can access collections they should not have permission to view. Patches are available in versions 9.1.0-rc0, 8.3.9, 9.0.0-rc2, and 9.1.0-rc1024.

## Affected products

- MongoDB Server Prior to 9.1.0-rc0, 8.3.9, 9.0.0-rc2, and 9.1.0-rc1024

## Timeline

- 2026-09-08: disclosed
- 2026-09-08: patched: Patches released in versions 9.1.0-rc0, 8.3.9, 9.0.0-rc2, and 9.1.0-rc1024

## References

- [https://jira.mongodb.org/browse/SERVER-132125](https://jira.mongodb.org/browse/SERVER-132125)

## Related threats

- [MongoDB replica-set denial of service via unreclaimed wait records](https://junglewise.ai/threats/cve-2026-120828-a-replica-set-database-server-node-does-not-limit-or-reclaim)
- [MongoDB privilege escalation via change stream showSystemEvents](https://junglewise.ai/threats/cve-2026-120816-a-user-with-basic-read-tier-database-privileges-can-use-an)
- [MongoDB macOS TLS certificate validation bypass for IPv6](https://junglewise.ai/threats/cve-2026-120808-an-issue-exists-in-mongodb-s-macos-tls-client-implementation)
- [MongoDB resource leak in SSPI Kerberos authentication handler](https://junglewise.ai/threats/cve-2026-120804-a-flaw-exists-in-the-server-side-sspi-kerberos-authentication)
- [MongoDB use-after-free in SBE window function accumulator](https://junglewise.ai/threats/cve-2026-120803-a-use-after-free-issue-exists-in-mongodb-s-sbe-slot-based)