CVE-2026-111367 — BillionMail through 4.9 Forgeable JWTs via Default Signing Key
BillionMail through 4.9 contains a hard-coded cryptographic key vulnerability that allows unauthenticated attackers to forge unsubscribe and subscribe-confirm JWTs by computing …
Published: 2026-10-15 · CVSS: 6.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7