Shared integration takeover via OAuth reconnect permission mismatch
Published Jun 23, 2026 · Updated Jun 23, 2026
Authorization bypass in n8n before 1.123.43, 2.0.0-rc.0 through 2.20.6, and 2.21.0 allows remote authenticated users to replace OAuth tokens. The OAuth1 and OAuth2 credential reconnect endpoints authorize token replacement with credential:read instead of credential:update, allowing read-only users to bind shared credentials to external accounts they control. Exploitation requires an authenticated account with read access to a credential shared across users or projects; affected workflows then run under the attacker's OAuth identity, permitting exfiltration to external services and persistent takeover of the integration.
Summary
What happened
Authorization bypass in n8n before 1.123.43, 2.0.0-rc.0 through 2.20.6, and 2.21.0 allows remote authenticated users to replace OAuth tokens. The OAuth1 and OAuth2 credential reconnect endpoints authorize token replacement with credential:read instead of credential:update, allowing read-only users to bind shared credentials to external accounts they control. Exploitation requires an authenticated account with read access to a credential shared across users or projects; affected workflows then run under the attacker's OAuth identity, permitting exfiltration to external services and persistent takeover of the integration.
The record
- CVE
- CVE-2026-45732
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Vendor
- n8n
- Product
- n8n
- Classifications
- CWE-639, T1098
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 23, 2026CVE publishedPublication date reported by the CVE source.
- Jun 23, 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.
- Affected versionversion=< 1.123.43
- Affected versionversion=>= 2.0.0-rc.0, < 2.20.7
- Affected versionversion=>= 2.21.0, < 2.21.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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