CVE-2026-103259
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a session token leakage vulnerability…
- Risk score
- 48/100
- CVSS
- 7.6 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 1 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a session token leakage vulnerability in the Dynamic Credentials authorize and revoke endpoints. Attackers with resolver registration capability can capture collaborators' session tokens by setting a fallback resolver to an attacker-controlled endpoint during…
- Affected
- See advisory
- Fix
- Upgrade the product to 2.39.6, 2.40.0 or 2.40.1 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.6 high
References
Original description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a session token leakage vulnerability in the Dynamic Credentials authorize and revoke endpoints. Attackers with resolver registration capability can capture collaborators' session tokens by setting a fallback resolver to an attacker-controlled endpoint during the account connection flow, enabling unauthorized credential access.
Last activity 1 Oct 2026. Patch Forecast updates every hour.