CVE-2026-123621

HIGH 8.8

Usermin through 2.570 Path Traversal File Write via detachall.cgi

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	webmin
Product	usermin
Published	Nov 6, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

webmin / usermin

0 ≤ 2.570

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/webmin/usermin/issues/142 github.com: https://github.com/webmin/usermin github.com: https://github.com/webmin/usermin/commit/cb4614e8319e0932b10533a4d5606debf5f40e14 github.com: https://github.com/webmin/usermin/blob/2.570/mailbox/detachall.cgi#L43-L51 hackmd.io: https://hackmd.io/@leediay/H144QKY6zl vulncheck.com: https://www.vulncheck.com/advisories/usermin-through-2.570-path-traversal-file-write-via-detachall-cgi

Credits

leediay153 from Viettel Post Ilia Ross (iliaross)