CVE-2026-65591
n8n before 1.123.64 Sanitizer Bypass Remote Code Execution
CVE-2026-65591 is a high vulnerability (CVSS 8.9) in N8n, published July 22, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.69%, the 53rd percentile. Fixed in n8n 1.123.64.
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
n8n before 1.123.64 Sanitizer Bypass Remote Code Execution
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
CVE-2026-65591- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L - Weakness
- CWE-917
- Updated
- 2026-11-02
EUVDEUVD-2026-47635
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
EUVD-2026-47635- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m7jc-p4hf-xhwq
Duplicate Advisory: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-pm35-fqvh-cq5g. This link is maintained to preserve external references.
Original Description
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
GHSA-m7jc-p4hf-xhwq- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/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 - Weakness
- CWE-917
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-pm35-fqvh-cq5g
n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
Impact
The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.
The legacy expression engine is the default engine in affected versions.
Patches
The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict n8n instance access to fully trusted users only.
- Switch to the non-legacy expression engine by setting
N8N_EXPRESSION_ENGINE=vm.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
- Record
GHSA-pm35-fqvh-cq5g- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L - Weakness
- CWE-917
- Updated
- 2026-11-02
NVD
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
CVE-2026-65591- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/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 - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-917
- Updated
- 2026-11-02
OSV
n8n before 1.123.64 Sanitizer Bypass Remote Code Execution
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
CVE-2026-65591- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L - Weakness
- CWE-917
- Updated
- 2026-11-02
OSVGHSA-m7jc-p4hf-xhwq
Duplicate Advisory: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-pm35-fqvh-cq5g. This link is maintained to preserve external references.
Original Description
n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.
- Record
GHSA-m7jc-p4hf-xhwq- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L/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 - Weakness
- CWE-917
- Updated
- 2026-11-02
OSVGHSA-pm35-fqvh-cq5g
n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
Impact
The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.
The legacy expression engine is the default engine in affected versions.
Patches
The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict n8n instance access to fully trusted users only.
- Switch to the non-legacy expression engine by setting
N8N_EXPRESSION_ENGINE=vm.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
- Record
GHSA-pm35-fqvh-cq5g- CVSS 4.0
- 8.9 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L - Weakness
- CWE-917
- Updated
- 2026-11-02
OSVROOT-APP-NPM-CVE-2026-65591 No score
CVE-2026-65591 in n8n - Patched by Root
Root has patched CVE-2026-65591 in the n8n package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-CVE-2026-65591- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
n8nnpm |
before 1.123.64 | 1.123.64 |
n8nnpm |
2.30.0 up to 2.30.1 | 2.30.1 |
n8nnpm |
2.0.0-rc.0 up to 2.29.8 | 2.29.8 |
n8nRoot:npm |
before 2.19.3-aikido.11 | 2.19.3-aikido.112.19.3-aikido.122.19.3-aikido.132.19.3-aikido.142.19.3-aikido.15 |
@rootio/n8nRoot:npm |
before 2.19.3-root.io.11 | 2.19.3-root.io.112.19.3-root.io.122.19.3-root.io.132.19.3-root.io.142.19.3-root.io.15 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | IamDremig/CVE-2026-65591 | 2026-08-10 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | affected | |
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub |
References
github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g
vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution
nvd.nist.gov/vuln/detail/CVE-2026-65591