{"id":"CVE-2026-111367","title":"BillionMail through 4.9 Forgeable JWTs via Default Signing Key","summary":"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 …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cvssSource":"cna","cwe":["CWE-1394"],"vendor":"aaPanel","product":"BillionMail","affected":["BillionMail <= 4.9"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:43:50.886Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111367","references":[{"url":"https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery"},{"url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123"},{"url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml"},{"url":"https://github.com/aaPanel/BillionMail"},{"url":"https://www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-key","label":"VulnCheck Advisory: BillionMail through 4.9 Forgeable JWTs via Default Signing Key"}],"tags":["cve.org"],"ingestedAt":"2026-10-15T22:48:25.459Z","slug":"CVE-2026-111367","body":"## Overview\n\nBillionMail 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.\n\n## Affected\n\n- `BillionMail <= 4.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}