CVE-2026-111367
BillionMail through 4.9 Forgeable JWTs via Default Signing Key
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 15, 2026
- Updated
- Oct 21, 2026
- Reserved
- Oct 15, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-1394 Use of Default Cryptographic Key
Affected Products
| Product | Versions |
|---|---|
BillionMailaaPanel |
|
References
- https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgerythird-party-advisory
- https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123technical-description
- https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yamltechnical-description
- https://github.com/aaPanel/BillionMailproduct
- VulnCheck Advisory: BillionMail through 4.9 Forgeable JWTs via Default Signing Keythird-party-advisory
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