# CVE-2026-116747: Kener 3.0.0 before 4.1.10 Authentication Bypass via Hardcoded Fallback JWT Secret

Status: published. Published: 2026-10-26. Updated: 2026-11-05.

Kener 3.0.0 before 4.1.10 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge session tokens by using the hardcoded DUMMY_SECRET fallback key. When KENER_SECRET_KEY is empty or unset, attackers knowing an administrator email can sign a kener-user cookie to access /manage/api with full administrative privileges or forge password-reset tokens.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/rajnandan1/kener/commit/ff636483544c926eab5b5e3e26b811c0f52bcaf8

## Affected products and versions

- rajnandan1 / kener (rajnandan1/kener): ≥ 3.0.0; < 4.1.10 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.2 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 9.2 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.62% as of 2026-11-05; percentile 50.02%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-321

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/rajnandan1/kener/issues/871 (CNA: VulnCheck; issue-tracking)

- https://github.com/rajnandan1/kener (CNA: VulnCheck; product)

- https://github.com/rajnandan1/kener/commit/ff636483544c926eab5b5e3e26b811c0f52bcaf8 (CNA: VulnCheck; patch)

- https://github.com/rajnandan1/kener/releases/tag/v4.1.10 (CNA: VulnCheck; release-notes)

- https://github.com/rajnandan1/kener/blob/v4.1.9/src/lib/server/controllers/commonController.ts#L44-L55 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/kener-3.0.0-before-4.1.10-authentication-bypass-via-hardcoded-fallback-jwt-secret (CNA: VulnCheck; third-party-advisory)

- https://github.com/rajnandan1/kener (disclosure@vulncheck.com)

- https://github.com/rajnandan1/kener/blob/v4.1.9/src/lib/server/controllers/commonController.ts#L44-L55 (disclosure@vulncheck.com)

- https://github.com/rajnandan1/kener/commit/ff636483544c926eab5b5e3e26b811c0f52bcaf8 (disclosure@vulncheck.com)

- https://github.com/rajnandan1/kener/issues/871 (disclosure@vulncheck.com)

- https://github.com/rajnandan1/kener/releases/tag/v4.1.10 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/kener-3.0.0-before-4.1.10-authentication-bypass-via-hardcoded-fallback-jwt-secret (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-116747; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116747; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116747; retrieved 2026-11-05; source updated Not reported

Revision: ae18404cd19f44b2c4707d597d741c4d12742f1c5070ae3f38d910d4eb955817

Canonical: https://y2.dev/cve/CVE-2026-116747

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