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Vulnerability Details :

CVE-2026-27493

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-25 Feb, 2026 | 22:05
Updated At-26 Feb, 2026 | 20:27
Rejected At-
Credits

n8n has Unauthenticated Expression Evaluation via Form Node

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
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N/A
No data available for selected date range
Percentile
Latest Percentile
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N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:25 Feb, 2026 | 22:05
Updated At:26 Feb, 2026 | 20:27
Rejected At:
▼CVE Numbering Authority (CNA)
n8n has Unauthenticated Expression Evaluation via Form Node

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.

Affected Products
Vendor
n8n-io
Product
n8n
Versions
Affected
  • < 1.123.22
  • >= 2.0.0, < 2.9.3
  • >= 2.10.0, < 2.10.1
Problem Types
TypeCWE IDDescription
CWECWE-94CWE-94: Improper Control of Generation of Code ('Code Injection')
CWECWE-95CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Type: CWE
CWE ID: CWE-94
Description: CWE-94: Improper Control of Generation of Code ('Code Injection')
Type: CWE
CWE ID: CWE-95
Description: CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Metrics
VersionBase scoreBase severityVector
4.09.5CRITICAL
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
Version: 4.0
Base score: 9.5
Base severity: CRITICAL
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/n8n-io/n8n/security/advisories/GHSA-75g8-rv7v-32f7
x_refsource_CONFIRM
https://github.com/n8n-io/n8n/issues/19
x_refsource_MISC
https://github.com/n8n-io/n8n/commit/562d867483e871b0f1e31776252e23bd721df75b
x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22
x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1
x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3
x_refsource_MISC
Hyperlink: https://github.com/n8n-io/n8n/security/advisories/GHSA-75g8-rv7v-32f7
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/n8n-io/n8n/issues/19
Resource:
x_refsource_MISC
Hyperlink: https://github.com/n8n-io/n8n/commit/562d867483e871b0f1e31776252e23bd721df75b
Resource:
x_refsource_MISC
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22
Resource:
x_refsource_MISC
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1
Resource:
x_refsource_MISC
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:25 Feb, 2026 | 23:16
Updated At:27 Feb, 2026 | 14:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.09.5CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 9.5
Base severity: CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-94Primarysecurity-advisories@github.com
CWE-95Primarysecurity-advisories@github.com
CWE ID: CWE-94
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-95
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/n8n-io/n8n/commit/562d867483e871b0f1e31776252e23bd721df75bsecurity-advisories@github.com
N/A
https://github.com/n8n-io/n8n/issues/19security-advisories@github.com
N/A
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22security-advisories@github.com
N/A
https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1security-advisories@github.com
N/A
https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3security-advisories@github.com
N/A
https://github.com/n8n-io/n8n/security/advisories/GHSA-75g8-rv7v-32f7security-advisories@github.com
N/A
Hyperlink: https://github.com/n8n-io/n8n/commit/562d867483e871b0f1e31776252e23bd721df75b
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/n8n-io/n8n/issues/19
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/n8n-io/n8n/security/advisories/GHSA-75g8-rv7v-32f7
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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CVE-2026-27577
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Matching Score-6
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CVSS Score-9.4||CRITICAL
EPSS-0.09% / 25.42%
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n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. 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. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

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