CVE-2026-123620— Usermin through 2.570 OS Command Injection via Read Mail IMAP Folder Deletion

Quick assessment

Affected

webmin usermin

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Usermin 2.570 及更早版本中的“读取邮件”模块存在操作系统命令注入漏洞。该漏洞允许已认证用户通过未过滤的 IMAP 文件夹名称执行任意命令。攻击者可使用外部 IMAP 客户端创建包含 Shell 元字符的文件夹，随后在 Usermin 中删除该文件夹，从而以系统账户身份执行命令，绕过仅限网页邮件的限制。

CVSS 7.5 · High Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

OS命令中使用的特殊元素转义处理不恰当(OS命令注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
webmin	usermin	0 ~ 2.570	-

II. Public POCs for CVE-2026-123620

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123620

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Other References for CVE-2026-123620 (6)

https://github.com/webmin/usermin product
https://github.com/webmin/usermin/issues/142 issue-tracking
https://github.com/webmin/usermin/commit/8a45420282ff04c943f05d9241a3c55afb9bca79 patch
https://hackmd.io/@leediay/H144QKY6zl technical-description
https://github.com/webmin/usermin/blob/2.570/mailbox/mailbox-lib.pl#L1031-L1040 technical-description
https://www.vulncheck.com/advisories/usermin-through-2.570-os-command-injection-via-read-mail-imap-folder-deletion third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123620

Same Patch Batch · webmin · 2026-11-06 · 3 CVEs total

CVE-2026-123621	8.8 HIGH	Usermin through 2.570 Path Traversal File Write via detachall.cgi
CVE-2026-123622	6.1 MEDIUM	Usermin through 2.570 XSS via mailbox detach.cgi type Parameter

IV. Related Vulnerabilities

Same product: usermin

Same vendor: webmin

Same weakness: CWE-78