PunchIn-App punchin-email up to 1.4.x Inbound Mail handleInbound information disclosure

Summaryinfo

A vulnerability was found in PunchIn-App punchin-email up to 1.4.x and classified as problematic. The affected element is the function handleInbound of the component Inbound Mail Handler. The manipulation results in information disclosure. This vulnerability is known as CVE-2026-54649. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in PunchIn-App punchin-email up to 1.4.x. Affected is the function handleInbound of the component Inbound Mail Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-54649 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 1.5.0 eliminates this vulnerability.

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Productinfo

Vendor

• PunchIn-App

Name

• punchin-email

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4

Website

• Product: https://github.com/PunchIn-App/punchin-email/

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