CVE Watch24 sept 2026

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, handle

CVSS

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Sin CVSS

EPSS

0.8%

p56

KEV

—

Exploit Today

0-100

Publicado: 17 sept 2026 · Última mod.: 24 sept 2026 · CWE-200 · CWE-201

EPSS · 30d

0.5%EPSS · 30 días0.8%

2026-09-182026-09-25

Descripción técnica

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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