CVE-2026-111367CWE-1394

CVE-2026-111367

Medium · published October 16, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
17.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
6.9 · 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
EPSS
0.00262 · 17.0th percentile
Weakness
CWE-1394 · Use of Default Cryptographic Key
Published
2026-10-16T02:19Z
References (6)
https://github.com/aaPanel/BillionMail · [email protected]https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123 · [email protected]https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml · [email protected]https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery · [email protected]https://www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-key · [email protected]https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 21:43Z
    BillionMail through 4.9 Forgeable JWTs via Default Signing Key
    cvelistv5
  • 15 OCT 21:43Z
    BillionMail through 4.9 Forgeable JWTs via Default Signing Key
    cvelistv5