CVE-2026-103250 PUBLISHED

n8n before 1.123.80, 2.39.6, and 2.40.1 NoSQL Injection via MongoDB Chat Memory

Assigner: VulnCheck
Reserved: 30.09.2026 Published: 01.10.2026 Updated: 01.10.2026

n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a NoSQL injection vulnerability in the MongoDB Chat Memory node that fails to validate the sessionId parameter. Unauthenticated attackers can supply MongoDB query operators in the sessionId field to access conversation histories from other users and perform unauthorized write and delete operations.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L
CVSS Score: 7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	Present	Availability	None	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L
CVSS Score: 8.1

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	n8n-io
Product	n8n
Versions	Default: unaffected affected from 0 to 1.123.80 (excl.) affected from 2.0.0 to 2.39.6 (excl.) affected from 2.40.0 to 2.40.1 (excl.)

CVE-2026-103250 PUBLISHED

n8n before 1.123.80, 2.39.6, and 2.40.1 NoSQL Injection via MongoDB Chat Memory

Metrics

Product Status

Credits

References

Problem Types