CVE-2026-111367
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductBillionMail
PublishedOct 15, 2026
First seenOct 15, 2026
Weakness typeCWE-1394CWE-1394
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| aaPanel BillionMail | v ≤ 4.9 | — |
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