CVE-2026-33185

MEDIUM

Discourse: Group SMTP test endpoint susceptible to SSRF

Title source: cna

Description

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.

References (2)

[X_Refsource_Confirm] https://github.com/discourse/discourse/security/advisories/GHSA-5976-77mj-m4h3

[X_Refsource_Misc] https://github.com/discourse/discourse/commit/e75cf456e8e318290c569bd6e8fa0f2586ffc530

View Writeup ZIP pw:eip

Scores

CVSS v3 5.0

EPSS 0.0003

EPSS Percentile 8.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-918

Status published

Products (5)

discourse/discourse 2026.3.0 (2 CPE variants)

discourse/discourse 2026.1.0 - 2026.1.3

discourse/discourse >= 2026.1.0-latest, < 2026.1.3

discourse/discourse >= 2026.2.0-latest, < 2026.2.2

discourse/discourse >= 2026.3.0-latest, < 2026.3.0

Published Mar 31, 2026

Tracked Since Mar 31, 2026