{"id":"CVE-2026-111367","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-111367","generatedAt":"2026-10-28T01:11:34.025Z","title":"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.","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.","published":"2026-10-15T22:19:35.000Z","lastModified":"2026-10-21T02:17:06.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-1394"],"affected":[],"epss":{"score":0.00332,"percentile":0.26204,"date":"2026-10-26","history":[{"date":"2026-10-16","score":0.00262,"percentile":0.16805}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.33%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-15T22:19:35.000Z","detail":{"score":"6.9","severity":"MEDIUM","publishedAt":"2026-10-15T22:19:34.703Z"},"summary":"New CVE, medium severity (CVSS 6.9)."}],"references":[{"url":"https://github.com/aaPanel/BillionMail","source":"disclosure@vulncheck.com"},{"url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123","source":"disclosure@vulncheck.com"},{"url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml","source":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-key","source":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-111367","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}