CVE-2026-111367

MediumCVSS 6.5/10Last modified Oct 21, 2026

Description

BillionMail through 4.9 contains a hard-coded cryptographic key vulnerability that allows unauthenticated attackers to forge unsubscribe and subscribe-confirm JWTs by computing the key from shipped configuration constants. Attackers can submit forged tokens to /api/unsubscribe, /api/unsubscribe_new, or /api/subscribe/confirm to deactivate any contact or force confirmed subscriptions.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Weakness enumeration

CWE-1394

Affected software

No affected versions have been published.

Timeline

Published
Oct 15, 2026
Last modified
Oct 21, 2026
NVD status
Deferred

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CVE-2026-111367: Medium severity, CVSS 6.5 | Vulnix