Medium severity · published Mar 31, 2026
CVE-2026-33185
Discourse: Group SMTP test endpoint susceptible to SSRF
5.0
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
>= 2026.1.0-latest, < 2026.1.3; >= 2026.2.0-latest, < 2026.2.2; >= 2026.3.0-latest, < 2026.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33185
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33185
Patch
https://github.com/discourse/discourse/commit/e75cf456e8e318290c569bd6e8fa0f2586ffc530
Vendor Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-5976-77mj-m4h3
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