n8n is vulnerable to Improper Authorization through its /stop endpoint

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

4.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/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 · score source

EPSS

• CVE-2025-52554: 0.37% estimated exploitation activity in the next 30 days; percentile 30.57 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary An authorization vulnerability was discovered in the /rest/executions/:id/stop endpoint of n8n. An authenticated user can stop workflow executions that they do not own or that have not been shared with them, leading to potential business disruption. Impact This is an improper authorization vulnerability. While most API methods enforce user-scoped access to workflow execution IDs, the /stop endpoint fails to do so. An attacker can guess or enumerate execution IDs (which are sequential and partially exposed via verbose error messages) and terminate active workflows initiated by other users. Who is impacted: - Environments where multiple users with varying trust levels share access to the same n8n instance. - All users running long-running or time-sensitive workflows (e.g., using the wait node). An attacker with authenticated access can exploit this flaw to: - Disrupt other users’ workflow executions. - Cause denial of service for business-critical automations. Patches The issue…

Published by the source

3 Jul 2025, 20:23 UTC

Last modified by the source

10 Jul 2025, 14:04 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-gq57-v332-7666

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-gq57-v332-7666

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# Patch Next advisory brief: CVE-2025-52554

Advisory: n8n is vulnerable to Improper Authorization through its `/stop` endpoint
IDs: CVE-2025-52554, GHSA-gq57-v332-7666
Record: https://patchnext.com/advisories/cve-2025-52554 (revision 3, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: n8n 1.99.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm n8n: affected < 1.99.1; fixed in 1.99.1

## Suggested inspection (read-only)
- `npm ls n8n --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on n8n.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gq57-v332-7666 (OSV record GHSA-gq57-v332-7666 lists affected ranges: npm n8n >=0 <1.99.1 (fixed))
- Verified: https://github.com/advisories/GHSA-gq57-v332-7666 (GitHub-reviewed advisory GHSA-gq57-v332-7666 lists affected ranges: npm n8n >=0 <1.99.1)

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