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TI-2026-84556 Aliases CVE-2026-120567

Expression injection in MongoDB Entity Framework Core provider updates

Priority LOW 11CWE-943Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

The MongoDB Entity Framework Core Provider from 9.1.3 through 9.1.4 and from 10.0.3 through 10.0.4 does not neutralize special elements in values passed to SetProperty (CWE-943). When an ExecuteUpdate call also has a setter that reads the updated entity, the update runs as an aggregation pipeline, and a string starting with $ is evaluated as an expression rather than stored as data. An attacker with low privileges who can influence such a value over the network may modify or remove fields in the updated records or copy other fields of the same record into them.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

The MongoDB Entity Framework Core provider does not neutralize special elements in values passed to SetProperty when an ExecuteUpdate call also contains a setter that reads the entity being updated. In that case the update is sent as an aggregation pipeline, and a caller-supplied string beginning with $ is evaluated as an expression rather than stored as data. A party who can influence such a value may modify or remove fields in the records being updated, or copy other fields of the same record into them.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0015 4th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MongoDBEntity Framework Core Provider9.1.3 – 9.1.4; 10.0.3 – 10.0.4—No fix listedCNA
  • Entity Framework Core Provider VendorMongoDB Affected 9.1.3 – 9.1.4; 10.0.3 – 10.0.4 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Entity Framework Core Provider.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-120567
  2. 2026-11-04 Title updated · CNA
  3. 2026-11-06 CISA SSVC decision points changed

References

Other 1

  • TI-2019-08023 Code injection in mongo-express KEVCVSS 3.1CRITICAL 9.9
  • TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
  • TI-2026-79432 BSON output corruption via out-of-range binary subtype in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79424 NoSQL command injection via mismatched BSON length in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79422 Unbounded memory growth in MongoDB C# Driver BSON deserialization CVSS 4.0HIGH 8.2
  • TI-2026-79427 Authentication bypass via issuer-and-serial-only certificate equality CVSS 4.0HIGH 7.6
See all 376 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences