Vulnerability in Aapanel Billionmail
CVE-2026-111367
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-se… (third-party-advisory)
- github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go (technical-description)
- github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml (technical-description)
- github.com/aaPanel/BillionMail (product)
- www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111367?
- CVE-2026-111367 is a medium-severity vulnerability in Aapanel Billionmail, classified under CWE-1394. CVSS score: 6.5/10. Published 2026-10-15.
- How severe is CVE-2026-111367?
- Medium severity. CVSS v3 base score is 6.5 out of 10.