Improper Authorization in MongoDB Server Sharded View Definition Handling Leads to Cross-Database Unauthorized Access
- Exploited
- No known exploitation
- Fix
- Fixed in 9.0.7
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 9.0.7.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 27/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The MongoDB Server software, in sharded deployments, has an authorization flaw in how it handles view definitions. An attacker who can reach the server over the network and log in with basic read-write rights on a single database could read data belonging to other databases on the same shard.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
An authorization flaw in the aggregation and view-definition handling of sharded deployments may allow a user holding only basic read-write privileges on a single database to define a view whose underlying processing is not fully subjected to privilege checking. Reading that view may result in unintended access to data belonging to other databases held on the same shard.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure3/25Reachable over the network · Unknown: No advisory context yet
- Reach17/20Affects MongoDB (a widely deployed server, runtime, framework or database)
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 82 if added to CISA KEV
- Would score about 77 if CISA's SSVC rates exploitation active
- Would score about 46 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 9.0.7.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-120826 (Improper Authorization in MongoDB Server Sharded View Definition Handling Leads to Cross-Database Unauthorized Access), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-120826 (entry last updated 2026-11-10): Affected: - MongoDB MongoDB Server: from 9.0.0, fixed in 9.0.7 Fixed versions: 9.0.7. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-120826 is not listed as of cve.now's last read. This KEV status is for CVE-2026-120826 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://jira.mongodb.org/browse/SERVER-137361 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-120826 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-120826.
Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- MongoDB MongoDB Server
From 9.0.0 · fixed in 9.0.7
Evidence 3
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-120826
Is CVE-2026-120826 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-120826?
MongoDB Server: from 9.0.0 before 9.0.7.Source: cve.now feed data
How do I fix CVE-2026-120826?
Upgrade to a fixed version: 9.0.7.Source: cve.now feed data