Authorization Bypass Through User-Controlled Key Affecting n8n-nodes-base package, versions <1.121.44>=2.0.0 <2.33.1>=2.34.0 <2.34.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 Sept 2026
- disclosed4 Aug 2026
- creditUnknown
Introduced: 4 Aug 2026
CVE-2026-77081 (opens in a new tab)How to fix?
Upgrade n8n-nodes-base to version 1.121.44, 2.33.1, 2.34.1 or higher.
Overview
n8n-nodes-base is a Base nodes of n8n
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the GraphQL node's Authentication parameter, which accepts expression values and, when several credentials of different types are attached in expression mode, resolves the allowed-domains policy from the first credential alone while attaching the material from all of them. A user with workflow authoring rights can send a domain restricted credential to an endpoint of their choosing, by configuring a GraphQL node with multiple credentials of differing types in expression mode so the permissive policy governs the request. This requires an authenticated account able to create or edit workflows, and the consequence is bounded by whatever the leaked credential itself authorizes.
Workaround
This vulnerability can be avoided by restricting network egress from the n8n host so the node cannot reach endpoints outside the intended set.