CVE Explorer
CVE-2026-33393
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the `allowed_spam_host_domains` check used `String#end_with?` without domain boundary validation, allowing domains like `attacker-example.com` to bypass spam protection when `example.com` was allowlisted. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 require exact match or proper subdomain match (preceded by `.`) to prevent suffix-based bypass of `newuser_spam_host_threshold`. No kn
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.2"},{"status":"affected","version":">= 2026.2.0-latest, < 2026.2.1"},{"status":"affected","version":"= 2026.3.0-latest"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/discourse/discourse/commit/80b19c15fe9c7bc890d1a54f454c8446312ac6d2","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/80b19c15fe9c7bc890d1a54f454c8446312ac6d2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/references/1
{"name":"https://github.com/discourse/discourse/commit/d8467b9fbb3d9ed6047b4e508d3fef88a37b8a02","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/d8467b9fbb3d9ed6047b4e508d3fef88a37b8a02"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/references/2
{"name":"https://github.com/discourse/discourse/commit/f99099cfbc6b76fe39d6fa2daa48efd69497fb8e","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/f99099cfbc6b76fe39d6fa2daa48efd69497fb8e"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/references/3
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-95r5-p6qr-hgw6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-95r5-p6qr-hgw6"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e64c55b59fdcf93b8888737ea488b4d9eac7fffe95caf9ce3ccba66a03942501 · sha256:e5eb053ff264dded… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.