CVE-2026-103258 n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter Interpolation
Attackers can bypass filters in n8n nodes to expose bulk data like contact lists and tickets by exploiting unescaped parameter interpolation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103258?
CVE-2026-103258 is a medium-severity SQL injection vulnerability in n8n-io n8n, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain an unescaped parameter interpolation vulnerability in SendGrid, Freshservice, and ServiceNow nodes that allows attackers to bypass filters by breaking out of query literals. Attackers can exploit this by binding vulnerable node parameters to untrusted external input to widen single-record lookups into match-all queries, exposing bulk data including contact lists, tickets, and directory entries.
Weakness: CWE-943
Which versions are affected by CVE-2026-103258?
How do I fix CVE-2026-103258?
Upgrade to a fixed version.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-103258 being exploited?
There is no known exploitation of CVE-2026-103258 in the wild and no public exploit code.
Sources
Also known as GHSA-5pg9-2vqx-r6jm, GHSA-fr2j-m9j7-53r7, MINI-crh7-v6wv-8vq7.