Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2026-123621 Details

Description

Usermin through 2.570 contains a path traversal vulnerability in mailbox/detachall.cgi that allows remote unauthenticated attackers to write files outside the temporary directory via unsanitized attachment filenames. Attackers can email attachments with ../ sequences in filenames, and when the recipient downloads all attachments, files like ~/.forward are overwritten, enabling command execution.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://hackmd.io/@leediay/H144QKY6zl CISA-ADP
https://github.com/webmin/usermin [email protected]
https://github.com/webmin/usermin/blob/2.570/mailbox/detachall.cgi#L43-L51 [email protected]
https://github.com/webmin/usermin/commit/cb4614e8319e0932b10533a4d5606debf5f40e14 [email protected]
https://github.com/webmin/usermin/issues/142 [email protected]

see all 7 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-123621
NVD Published Date:
Nov 6, 2026
NVD Last Modified:
Nov 6, 2026
Source:
[email protected]
CVE-2026-123621 Details - Not Deferred