CVE-2026-123620

HIGH 7.5

Usermin through 2.570 OS Command Injection via Read Mail IMAP Folder Deletion

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Usermin through 2.570 contains an OS command injection vulnerability in the Read Mail module that allows authenticated users to execute commands through unsanitized IMAP folder names. Attackers can create a folder containing shell metacharacters via an external IMAP client, then delete it in Usermin to run commands as their system account, bypassing webmail-only restrictions.

CWE	CWE-78
Vendor	webmin
Product	usermin
Published	Nov 6, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

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/8a45420282ff04c943f05d9241a3c55afb9bca79 github.com: https://github.com/webmin/usermin/blob/2.570/mailbox/mailbox-lib.pl#L1031-L1040 hackmd.io: https://hackmd.io/@leediay/H144QKY6zl vulncheck.com: https://www.vulncheck.com/advisories/usermin-through-2.570-os-command-injection-via-read-mail-imap-folder-deletion

Credits

leediay153 from Viettel Post Ilia Ross (iliaross)