Detections
Analytics
SCA: security update for n8n (GHSA-75g8-rv7v-32f7)
critical Tenable Cloud Security Plugin ID 438016
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, a
second-order expression injection vulnerability existed in n8n's Form nodes that could allow an
unauthenticated attacker to inject and evaluate arbitrary n8n expressions by submitting crafted form data.
When chained with an expression sandbox escape, this could escalate to remote code execution on the n8n
host. The vulnerability requires a specific workflow configuration to be exploitable. First, a form node
with a field interpolating a value provided by an unauthenticated user, e.g. a form submitted value.
Second, the field value must begin with an `=` character, which caused n8n to treat it as an expression
and triggered a double-evaluation of the field content. There is no practical reason for a workflow
designer to prefix a field with `=` intentionally — the character is not rendered in the output, so the
result would not match the designer's expectations. If added accidentally, it would be noticeable and very
unlikely to persist. An unauthenticated attacker would need to either know about this specific
circumstance on a target instance or discover a matching form by chance. Even when the preconditions are
met, the expression injection alone is limited to data accessible within the n8n expression context.
Escalation to remote code execution requires chaining with a separate sandbox escape vulnerability. The
issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these
versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators
should consider the following temporary mitigations. Review usage of form nodes manually for above
mentioned preconditions, disable the Form node by adding `n8n-nodes-base.form` to the `NODES_EXCLUDE`
environment variable, and/or disable the Form Trigger node by adding `n8n-nodes-base.formTrigger` to the
`NODES_EXCLUDE` environment variable. These workarounds do not fully remediate the risk and should only be
used as short-term mitigation measures. (CVE-2026-27493)
See Also
Plugin Details
Severity: Critical
ID: 438016
Version: Revision 1.6
Type: Local
Family: SCA Checks
Published: 3/1/2026
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: High
Score: 7.7
Percentile: 99.07
Vendor
Vendor Severity: Critical
CVSS v2
Risk Factor: High
Base Score: 7.6
Temporal Score: 5.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-27493
CVSS v3
Risk Factor: Critical
Base Score: 9
Temporal Score: 7.8
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.5
Threat Score: 9.5
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 2/25/2026
Vulnerability Publication Date: 2/25/2026
Reference Information
CVE: CVE-2026-27493