CVE-2026-7386Public exploitNetwork attack vector

Arbitrary directory deletion via Message-ID path traversal

Published Apr 29, 2026 · Updated Apr 29, 2026

Path traversal in Mail MCP Bridge 1.3.0 through 1.3.3 allows remote attackers to delete accessible directories via crafted Message-IDs. The cleanup_attachments tool strips only angle brackets before joining each untrusted message_ids value to the cache root and recursively deleting the result. Exploitation requires access to invoke the MCP tool and filesystem permissions on a directory reachable from the attachment cache path.

CVSS severity7.3
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in Mail MCP Bridge 1.3.0 through 1.3.3 allows remote attackers to delete accessible directories via crafted Message-IDs. The cleanup_attachments tool strips only angle brackets before joining each untrusted message_ids value to the cache root and recursively deleting the result. Exploitation requires access to invoke the MCP tool and filesystem permissions on a directory reachable from the attachment cache path.

The record

CVE
CVE-2026-7386
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Fatbobman
Product
Mail MCP Bridge
Classifications
CWE-22, T1485
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.0
  2. Affected versionversion=1.3.1
  3. Affected versionversion=1.3.2
  4. Affected versionversion=1.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fatbobman · Mail MCP Bridgeversion=1.3.0; version=1.3.1; version=1.3.2; version=1.3.3

Published CVSS scores

5.5VulDBCVSS: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
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1485Data Destruction

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo