6.5Medium
Mongodb Mongodb
CVE-2026-18704
An issue in MongoDB Server's aggregation framework could allow an authenticated user with only read privileges to perform write operations against collections they should not be able to modify. This is due to an internal-use aggregation stage being reachable by external clients without an appropriate authorization check on its embedded operations.
What this means for your business
- It affects Mongodb. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, with an ordinary user login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.2% chance of attack attempts being seen in the next 30 days, ranking above 11% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Mongodb, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 6.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N- CVSS v4
- 7.1
- Weakness
- CWE-862
- Assigned by
- cna@mongodb.com
Dates
- Published
- 2026-08-11
- Last modified
- 2026-09-16
- Sources
- NVD
Affected products
- Mongodb Mongodb8.3.0 - 8.3.8
As listed in the NVD configuration data. Not a statement about your estate.