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 4.0
- 2.1
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 - EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-200, CWE-201
- Published
- Modified
- Record from
- the NVD, synced