CVE-2026-103250 n8n - NoSQL Injection

n8n < 1.123.80, 2.0.0 < 2.39.6, and 2.40.0 < 2.40.1 contain a NoSQL injection caused by improper validation of the sessionId parameter in the MongoDB Chat Memory node, letting unauthenticated attackers access and modify other users' conversation histories, exploit requires no authentication.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.20% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
NoSQL Injection
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:L
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-943

Vendor fix

Update to version 1.123.80, 2.39.6, 2.40.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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