CVE-2026-103248 n8n before 1.123.80, 2.39.6, and 2.40.1 PostgREST Filter Injection via Supabase
Attackers can inject PostgREST filters via untrusted input in n8n's Supabase node to read, update, or delete database records.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103248?
CVE-2026-103248 is a high-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 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a filter injection vulnerability in the Supabase node's Filters (String) mode that fails to escape field values. Attackers can inject filter expressions from untrusted input to read all table rows, update all records, or delete entire tables in a single request.
Weakness: CWE-89
Which versions are affected by CVE-2026-103248?
How do I fix CVE-2026-103248?
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-2026-103248 being exploited?
There is no known exploitation of CVE-2026-103248 in the wild and no public exploit code.
Sources
Also known as GHSA-c6j4-7wv3-xqf9, GHSA-xrqg-3xcp-h45x, MINI-v529-456v-p76r.