n8n is an open source workflow automation platform. Prior to 2.27.4 and from 2.28.0 prior to 2.28.1, n8n instances configured with more than one trusted token-exchange issuer resolved external identities to local accounts using only the JWT sub claim and ignored the iss claim, allowing an attacker with a valid token from one trusted issuer and a sub matching a victim under another issuer to authenticate as that victim. This issue is fixed in versions 2.27.4 and 2.28.1.
https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579w
Published: 2026-07-09
Updated: 2026-07-09
Base Score: 6.6
Vector: CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:N
Severity: Medium
Base Score: 6.8
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Severity: Medium
Base Score: 7.6
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Severity: High
EPSS: 0.00143