{"id":"CVE-2026-54649","summary":"punchin-email: Operator inbox (FORWARD_TO) disclosed to correspondents on reply — Cloudflare forward() drops the relay Reply-To","details":"punchin-email is a Cloudflare Email Worker that provides two-way role aliases while relaying mail to a private inbox. Prior to 1.5.0, handleInbound delivers inbound alias mail with message.forward(), which silently drops the added Reply-To header intended to route responses through the relay. When a correspondent sends mail to an alias and the operator replies, the mail client can send directly to the correspondent from the private FORWARD_TO inbox address, exposing that address. The disclosure is limited to the operator's own email address and does not expose third-party data or provide code execution or authentication bypass. This issue is fixed in version 1.5.0.","aliases":["GHSA-2ph7-69xm-hmwv"],"modified":"2026-09-19T03:46:48.467144914Z","published":"2026-09-17T18:29:23.937Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-200","CWE-201"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54649.json"},"references":[{"type":"WEB","url":"https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54649.json"},{"type":"ADVISORY","url":"https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54649"},{"type":"FIX","url":"https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084"},{"type":"FIX","url":"https://github.com/PunchIn-App/punchin-email/pull/66"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/punchin-app/punchin-email","events":[{"introduced":"0"},{"fixed":"593685ffc0b8eb3949a4838e7bfe1e97b953d084"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.5.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.4.0","v1.3.1","v1.3.0","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54649.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}