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TI-2026-42591 Aliases CVE-2026-59721

Hoppscotch: Admin RCE via MAILER_SMTP_URL nodemailer sendmail-transport injection

Priority HIGH 67CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution, Tampering
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-77 and CWE-915.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01009 63rd percentileScored 2026-11-07
Fix Fixed hoppscotch (hoppscotch): 2026.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
hoppscotchhoppscotchbefore 2026.6.02026.6.0Patch availableCNA
  • hoppscotch Vendorhoppscotch Affected before 2026.6.0 Fixed in 2026.6.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:hoppscotch:hoppscotch:*:*:*:*:*:*:*:*——hoppscotch
  • cpe:2.3:a:hoppscotch:hoppscotch:*:*:*:*:*:*:*:* Versions — — ·hoppscotch

Remediation

  • Fix · CNA hoppscotch (hoppscotch) Fixed in 2026.6.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59721

References

Other 4

  • TI-2026-36924 Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite CVSS 3.1CRITICAL 10.0
  • TI-2023-16943 Database password exposed in logs in hoppscotch CVSS 3.1HIGH 8.8
  • TI-2026-42590 Hoppscotch: Insecure Default Configuration Allows Public Exposure of Private Collection Data via Mock Server CVSS 3.1HIGH 7.5
  • TI-2026-32417 hoppscotch: Unauthenticated Onboarding Config Disclosure via Empty Recovery Token CVSS 3.1HIGH 7.5
  • TI-2026-27155 hoppscotch: Improper loopback redirect_uri validation in device-login flow CVSS 4.0HIGH 8.5
  • TI-2024-22688 @hoppscotch/cli affected by Sandbox Escape in @hoppscotch/js-sandbox leads to RCE CVSS 3.1HIGH 8.4
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences