BIT-discourse-2026-33393

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-33393.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-discourse-2026-33393
Aliases
Published
2026-03-27T07:10:50.748Z
Modified
2026-04-02T13:41:00.913763294Z
Summary
Discourse fixes loose hostname matching in spam host allowlist
Details

Discourse is an open-source discussion platform. Prior to versions 2026.3.0, 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, 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 known workarounds are available.

Database specific 
{
    "cpes": [
        "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
}
References

Affected packages

Bitnami / discourse

Package

Name
discourse
Purl
pkg:bitnami/discourse

Severity

  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator

Affected ranges

Type
SEMVER
Events
Introduced
2026.1.0
Fixed
2026.1.2
Introduced
2026.2.0
Fixed
2026.2.1
Introduced
2026.3.0
Fixed
2026.3.0

Database specific

source 
"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-33393.json"