VulnerabilityAnalyzed

CVE-2026-59208

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…

HIGH 7.6EPSS 3.13%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

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.

CVSS 4.0: 7.6 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 3.13% probability · 87th percentile
CISA KEV: Not listed
Weakness: CWE-287, CWE-346
Affected: n8n/n8n
Source: security-advisories@github.com

References

https://github.com/n8n-io/n8n/releases/tag/n8n%402.27.4Release Notes
https://github.com/n8n-io/n8n/releases/tag/n8n%402.28.1Release Notes
https://github.com/n8n-io/n8n/security/advisories/GHSA-mq3m-f8x3-579wVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.