{"id":"CVE-2026-111367","summary":"BillionMail through 4.9 Forgeable JWTs via Default Signing Key","details":"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.","modified":"2026-10-17T02:48:26.516693630Z","published":"2026-10-15T21:43:50.886Z","database_specific":{"cwe_ids":["CWE-1394"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111367.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111367.json"},{"type":"ADVISORY","url":"https://hackmd.io/@hieuPenguinnn/billionmail-unsubscribe-subscribe-jwt-deterministic-secret-forgery"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111367"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/billionmail-through-4.9-forgeable-jwts-via-default-signing-key"},{"type":"PACKAGE","url":"https://github.com/aaPanel/BillionMail"},{"type":"ARTICLE","url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/internal/service/batch_mail/jwt.go#L98-L123"},{"type":"ARTICLE","url":"https://github.com/aaPanel/BillionMail/blob/v4.9/core/manifest/config/config.yaml"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/Billionmail/BillionMail","events":[{"introduced":"0"},{"fixed":"8050523d2786cde0204736eaadd0d540b73e761a"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"4.9"},{"fixed":"4.9"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v4.8","V0.01"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111367.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}