Hoppscotch up to 2026.5.x Infra admin/infra.resolver.ts updateInfraConfigs MAILER_SMTP_URL os command injection

Summaryinfo

A vulnerability marked as very critical has been reported in Hoppscotch up to 2026.5.x. Affected is the function updateInfraConfigs of the file admin/infra.resolver.ts of the component Infra. The manipulation of the argument MAILER_SMTP_URL leads to os command injection. This vulnerability is referenced as CVE-2026-59721. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Hoppscotch up to 2026.5.x. This issue affects the function updateInfraConfigs of the file admin/infra.resolver.ts of the component Infra. The manipulation of the argument MAILER_SMTP_URL with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to 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 when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Hoppscotch is an open source API development ecosystem. Prior to 2026.6.0, the updateInfraConfigs GraphQL mutation in admin/infra.resolver.ts accepts an attacker-controlled MAILER_SMTP_URL value, and validateSMTPUrl in utils.ts permits path, query, or fragment content that nodemailer parses into sendmail transport options, allowing an admin to execute arbitrary commands as root in the backend container after restart and mail sending. This issue is fixed in version 2026.6.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-59721 since 07/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/09/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 2026.6.0 eliminates this vulnerability.

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Productinfo

Name

• Hoppscotch

Version

• 2026.0
• 2026.1
• 2026.2
• 2026.3
• 2026.4
• 2026.5

Website

• Product: https://github.com/hoppscotch/hoppscotch/

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