Medium severity6.5NVD Advisory· Published Oct 15, 2026
CVE-2026-111367
CVE-2026-111367
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.
Affected products
1- Range: <=4.9
Patches
Vulnerability mechanics
References
4- github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.gonvd
- github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yamlnvd
- hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgerynvd
- www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-keynvd
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