CVE-2026-59721: Hoppscotch: Admin RCE via MAILER_SMTP_URL nodemailer sendmail-transport injection

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-09 · updated 2026-07-10
Weakness: CWE-77

Description

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.

Affected products

hoppscotch: before 2026.6.0

References

https://github.com/hoppscotch/hoppscotch/commit/73a88c82b1b2cada26cc4b2bc095b54554242239
https://github.com/hoppscotch/hoppscotch/pull/6413
https://github.com/hoppscotch/hoppscotch/releases/tag/2026.6.0
https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-v7q6-r45w-2c6r
https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-v7q6-r45w-2c6r

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