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CVE-2026-65599n8n before 1.123.64, 2.29.8, and 2.30.1 Credential Exposure via JWT Header

Description

n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a credential exposure vulnerability: when configured with a Google Service Account key, the full PEM private key was mistakenly placed in the JWT header's kid field (intended only for a key identifier). Because JWT headers are Base64-encoded rather than encrypted, the private key could be recovered by anything that logged or inspected the JWT. An attacker who obtained the key could impersonate the service account and access or modify any Google Cloud resource it was authorized to use. Only instances using Google Service Account credentials are affected.

Timeline

  1. ID reserved

    By VulnCheck

  2. Published

  3. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-65599, by who scored it
Scored byCVSSScoreVector
VulnCheckCNA (assigner)4.0Medium5.1CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L
NVDNVD · Analyzed4.0Medium5.1CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.25% · top 84% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.

Affected products

  • n8n-io · n8n

    • affected < 1.123.64
    • unaffected 1.123.64

  • n8n-io · n8n

    • affected 2.30.0 – < 2.30.1
    • unaffected 2.30.1

  • n8n-io · n8n

    • affected 2.0.0-rc.0 – < 2.29.8
    • unaffected 2.29.8

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .