CVE-2026-54649 Information disclosure in punchin-email
An attacker can discover the operator's private email address when replying to alias mail due to a missing Reply-To header in Cloudflare Email Workers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-54649?
CVE-2026-54649 is a low-severity vulnerability in PunchIn-App punchin-email, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-54649?
How do I fix CVE-2026-54649?
No fix has been published for CVE-2026-54649 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54649 being exploited?
There is no known exploitation of CVE-2026-54649 in the wild and no public exploit code.
Sources
Also known as GHSA-2ph7-69xm-hmwv.