Webmin Usermin up to 2.570 Read Mail os command injection

Summaryinfo

A vulnerability has been found in Webmin Usermin up to 2.570 and classified as very critical. Affected by this vulnerability is an unknown functionality of the component Read Mail Module. This manipulation causes os command injection. The identification of this vulnerability is CVE-2026-123620. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Webmin Usermin up to 2.570 and classified as very critical. Affected by this vulnerability is an unknown part of the component Read Mail Module. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-123620 since 11/06/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/06/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Software Management Software

Vendor

• Webmin

Name

• Usermin

Version

• 2.570

License

• open-source

Website

• Product: https://github.com/webmin/usermin/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion