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CVE-2026-54649— punchin-email: Operator inbox (FORWARD_TO) disclosed to correspondents on reply — Cloudflare forward() drops the relay Reply-To

Quick assessment

Affected
PunchIn-App punchin-email
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

punchin-email 是一个 Cloudflare Email Worker，提供双向角色别名（role aliases）功能，并将邮件中继转发到私有收件箱。在 1.5.0 版本之前， 函数在处理传入的别名邮件时，使用 进行转发。这一操作会静默丢弃原本用于将回复邮件经由中继转发的 头。因此，当通信方发送邮件给某个别名，而管理员进行回复时，邮件客户端可能直接从私有的 收件箱地址向通信方发送回复邮件，从而暴露该私有地址。 此问题的影响仅限于管理员自身的邮箱地址，不会泄露第三方数据，也不会导致代码执行或身份验证绕过

CVSS 2.1 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
PunchIn-App punchin-email < 1.5.0 affected
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I. Basic Information for CVE-2026-54649

Vulnerability Information
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Vulnerability Title
punchin-email: Operator inbox (FORWARD_TO) disclosed to correspondents on reply — Cloudflare forward() drops the relay Reply-To
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PunchIn-App punchin-email < 1.5.0 -

II. Public POCs for CVE-2026-54649

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III. Intelligence Information for CVE-2026-54649

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Patches & Fixes for CVE-2026-54649 (2)

Vendor Advisories for CVE-2026-54649 (1)

Vendor Pages for CVE-2026-54649 (1)

IV. Related Vulnerabilities

Same weakness: CWE-200

V. Comments for CVE-2026-54649

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