CVE-2026-33185
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
Discourse has a vulnerability in the group email settings test endpoint that allows initiating outbound connections to arbitrary hosts and ports. The endpoint was accessible to non-staff group owners.
Risk Assessment
An attacker can probe internal network infrastructure, potentially revealing information about services and network topology.
Recommendation
Update Discourse to version 2026.1.3, 2026.2.2, or 2026.3.0, which contain the fix.
Original NVD description (English source)
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, the group email settings test endpoint could be used to make the server initiate outbound connections to arbitrary hosts and ports. This could allow probing of internal network infrastructure. The endpoint was accessible to non-staff group owners. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.