CVE-2026-33393: discourse discourse

Discourse fixes loose hostname matching in spam host allowlist

CVSS 4.3 MediumEPSS 0.0027 · 18th percentile

Published by the CVE Program (CNA: GitHub_M) at 19 Mar 2026, 22:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
discourse	discourse	affected >= 2026.1.0-latest, < 2026.1.2 affected >= 2026.2.0-latest, < 2026.2.1 affected = 2026.3.0-latest

Identifiers

CVE-2026-33393

CNA

GitHub_M

Weakness (CWE)

CWE-284

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.3	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0027, the 18th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 19 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.