{"id":"CVE-2026-54649","state":"PUBLISHED","title":"punchin-email: Operator inbox (FORWARD_TO) disclosed to correspondents on reply — Cloudflare forward() drops the relay Reply-To","description":"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.","publishedAt":"2026-09-17T18:29:23.937Z","updatedAt":"2026-09-24T20:55:22.973Z","severity":{"score":2.1,"label":"Low","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["PunchIn-App punchin-email"],"affected":[{"vendor":"PunchIn-App","product":"punchin-email","versions":[{"version":"< 1.5.0","status":"affected"}]}],"references":["https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv","https://github.com/PunchIn-App/punchin-email/pull/66","https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084","https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0"],"weaknesses":["CWE-200","CWE-201"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54649.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54649","state":"PUBLISHED","datePublished":"2026-09-17T18:29:23.937Z","dateUpdated":"2026-09-24T20:55:22.973Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T20:16:46.198Z"},"containers":{"cna":{"title":"punchin-email: Operator inbox (FORWARD_TO) disclosed to correspondents on reply — Cloudflare forward() drops the relay Reply-To","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"PunchIn-App","product":"punchin-email","versions":[{"version":"< 1.5.0","status":"affected"}]}],"references":[{"url":"https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv","name":"https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/PunchIn-App/punchin-email/pull/66","name":"https://github.com/PunchIn-App/punchin-email/pull/66","tags":["x_refsource_MISC"]},{"url":"https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084","name":"https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084","tags":["x_refsource_MISC"]},{"url":"https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0","name":"https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":2.1,"baseSeverity":"LOW","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","lang":"en","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-201","lang":"en","description":"CWE-201: Insertion of Sensitive Information Into Sent Data","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-17T18:29:23.937Z"},"source":{"advisory":"GHSA-2ph7-69xm-hmwv","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-54649","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-24T20:39:47.675180Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-24T20:55:22.973Z"}}]}}}