CVE-2026-111367
CVE-2026-111367 · BillionMail through 4.9 Forgeable JWTs via Default Signing Key
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.9 · Medium · EPSS 0.3%
- Published
- Updated
Affected products and versions
billionmail
- Versions
- ≥ 0, ≤ 4.9: Affected (custom)
No fix published
Original sources
- https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery
- https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123
- https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml
- https://github.com/aaPanel/BillionMail
- https://www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-key
- https://nvd.nist.gov/vuln/detail/CVE-2026-111367