CVE-2026-54649

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084
https://github.com/PunchIn-App/punchin-email/pull/66
https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0
https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv

Configurations

No configuration.

History

17 Sep 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 19:16

Updated : 2026-09-30 17:32

NVD link : CVE-2026-54649

Mitre link : CVE-2026-54649

CVE.ORG link : CVE-2026-54649

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-201

Insertion of Sensitive Information Into Sent Data

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