BIT-discourse-2026-72721

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-72721.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-discourse-2026-72721
Aliases
Published
2026-08-17T05:44:20.901Z
Modified
2026-08-17T08:10:35.880164157Z
Summary
Discourse: Onebox Domain Blocklist Bypass via Case-Sensitive Comparison
Details

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Onebox::DomainChecker.isblocked? compares hostnames and SiteSetting.blockedonebox_domains entries case-sensitively, allowing an attacker to bypass configured Onebox domain restrictions by changing character casing in a redirect target hostname. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

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

Affected packages

Bitnami / discourse

Package

Name
discourse
Purl
pkg:bitnami/discourse

Severity

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

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2026.1.6
Introduced
2026.5.0
Fixed
2026.5.2
Introduced
2026.6.0
Fixed
2026.6.1

Database specific

source 
"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-72721.json"