Is CVE-2026-103260 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103260 being exploited in the wild.

How severe is CVE-2026-103260?

Medium severity, with a CVSS score of 4, published 1 October 2026.

Which products and versions are affected?

N8n before 2.39.6; 2.40.0 before 2.40.1.

How is CVE-2026-103260 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-103260?

Check whether you run N8n at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-103260: n8n Send and Wait node approval bypass in Approve Within Chat

CVE-2026-103260 · Severity: medium · CVSS 4 · Published 2026-10-01

n8n is a workflow automation platform that allows organizations to build and execute automated processes. The Send and Wait node's "Approve Within Chat" feature is designed to pause workflows and request approval via Slack or Telegram before proceeding. An attacker who can see an approval message can bypass this gate entirely—without needing an n8n account or valid credentials—and advance the workflow to trigger the guarded action, such as submitting forms, transferring funds, or other sensitive operations.

Technologies: N8n. Vendors: N8n.

Quick answers

Is CVE-2026-103260 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103260 being exploited in the wild.
How severe is CVE-2026-103260?: Medium severity, with a CVSS score of 4, published 1 October 2026.
Which products and versions are affected?: N8n before 2.39.6; 2.40.0 before 2.40.1.
Is there a fix for CVE-2026-103260?: Yes: fixed in 2.39.6, 2.40.1. Until then: Restrict n8n instance access to fully trusted users only. Avoid using "Approve Within Chat" mode for Send and Wait nodes guarding high-consequence actions until patched. Limit membership of Slack or Telegram channels used for approvals to the minimum set of trusted users. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103260 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-103260?: Check whether you run N8n at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 2.39.6, 2.40.1

Restrict n8n instance access to fully trusted users only. Avoid using "Approve Within Chat" mode for Send and Wait nodes guarding high-consequence actions until patched. Limit membership of Slack or Telegram channels used for approvals to the minimum set of trusted users.

Technical details

The vulnerability is an authorization bypass (CWE-862) in the Send and Wait node's "Approve Within Chat" mode. The resume request endpoint fails to verify that the requester came from an authorized Slack or Telegram channel, nor does it validate against the approver allowlist. This allows unauthenticated users with only visibility of the approval message to submit resume requests. Exploitation requires the n8n instance to be publicly reachable over HTTPS and actively using "Approve Within Chat" mode; the attacker must observe the approval request for the target execution.

Affected products

n8n n8n before 2.39.6; 2.40.0 before 2.40.1

Timeline

2026-09-16: disclosed
2026-10-01: advisory
2026-09-16: patched

References

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