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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
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.
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Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "PunchIn-App",
"product": "punchin-email",
"versions": [
{
"version": "< 1.5.0",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON