CVE-2026-77069Network attack vector

Internal response disclosure via unguarded OAuth2 token exchange

Published Aug 20, 2026 · Updated Aug 20, 2026

SSRF in n8n before 1.123.69, 2.33.4, and 2.34.1 allows remote authenticated users to read internal responses via OAuth2. The access-token exchange uses a separate HTTP client without the SSRF guard applied to discovery and registration requests. Credential-creation permission and a completed OAuth2 flow are required, and disclosure is limited to responses produced for the fixed-shape token POST.

CVSS severity2.3
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in n8n before 1.123.69, 2.33.4, and 2.34.1 allows remote authenticated users to read internal responses via OAuth2. The access-token exchange uses a separate HTTP client without the SSRF guard applied to discovery and registration requests. Credential-creation permission and a completed OAuth2 flow are required, and disclosure is limited to responses produced for the fixed-shape token POST.

The record

CVE
CVE-2026-77069
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.123.69
  2. Affected versionversion=0 <2.33.4
  3. Affected versionversion=0 <2.34.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=0 <1.123.69; version=0 <2.33.4; version=0 <2.34.1

Published CVSS scores

2.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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