CVE-2026-56778

The setWebhookResolver in the application (likely n8n) lacks validation of user-supplied URLs. An authenticated user can make the server send repeated requests to internal endpoints, including link-local metadata addresses. The response is not returned via the API, making the attack blind.

Vulnerability in n8n before versions 1.123.67, 2.31.5, and 2.32.1 allows credential authorization bypass in the HTTP Request node. An authenticated member with edit access to a shared workflow can reference another user's credential while specifying the credential type via an expression. Because the pre-execution permission check compares the unresolved expression instead of the resolved credential type, the ownership check is skipped and the credential is loaded at execution time, allowing the member to use or exfiltrate a credential they were not granted.

Vulnerability in n8n before versions 2.31.5 and 2.32.1 allows account takeover via the Token Exchange Embed Login feature. When a validly-signed incoming token was matched to a local account by its email claim, the service did not verify that the email claim was verified, nor that the trusted key's permitted role ceiling covered that account. As a result, anyone able to obtain a token accepted by a configured trusted key could authenticate as any existing user and gain full account control.

n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.

Vulnerability in n8n before versions 1.123.67, 2.31.5, and 2.32.1 allows remote code execution in the Git node. Authenticated users with rights to create and execute workflows can stage a crafted local repository that causes git to run hooks under default git security settings, executing arbitrary commands as the n8n process user. Both self-hosted and cloud instances are affected.

n8n's JavaScript task runner shared a single module cache across all users' Code-node executions. In affected versions (before 1.123.67, 2.31.5, and 2.32.1), a user able to run a Code node could poison a cached module and thereby alter other users' Code-node executions on the same runner, affecting their confidentiality, integrity, or availability. This is a cross-user isolation break within a single n8n instance and does not constitute a sandbox escape or remote code execution. Only multi-user instances running the JS task runner with built-in or external modules enabled are affected.

Vulnerability in n8n before versions 1.123.67, 2.31.5, and 2.32.1 allows arbitrary file write in the Edit Image node, which passes its output format parameter to the underlying image library without validation. An authenticated user able to run workflows can supply a crafted format value to write arbitrary files outside the node's working directory on the n8n instance.

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an authenticated user with permission to create or modify workflows could achieve global prototype pollution via the XML Node leading to RCE when combined with other nodes exploiting the prototype pollution. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

In n8n before 2.29.8 and 2.30.x before 2.30.1, the @n8n/computer-use package does not enforce shell sandbox restrictions on Linux and Windows (sandboxing was applied only on macOS). Shell commands executed by the tool run without any filesystem or network restrictions, allowing unrestricted access to the host filesystem and network from within the computer-use agent process. This issue only affects deployments where the @n8n/computer-use package is explicitly installed and running; standard n8n installations are not affected.

n8n versions before 2.20.0 contain a credential exfiltration vulnerability in the POST /rest/dynamic-node-parameters/options endpoint that allows authenticated users to bypass Allowed HTTP Request Domains restrictions. Attackers with credential access can cause the n8n server to issue HTTP requests with credentials to unauthorized hosts.