Medium
Discourse: Onebox iframe origin allowlist enforces URL authority boundary
Type: advisorySources: OSV
Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-72728
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:39 UTC · Revision 1
Source evidence
Discourse: Onebox iframe origin allowlist enforces URL authority boundary
core-osv · Original sourcePublished 10 Aug 2026, 16:13 UTC
Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.
osv:CVE-2026-72728
Complete source record
{
"id": "e37f8a5eabcf63509d195a6abe4b97cd2f560af0930524003b3259a28f943e5e",
"url": "https://osv.dev/vulnerability/CVE-2026-72728",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Discourse: Onebox iframe origin allowlist enforces URL authority boundary",
"summary": "Discourse is an open-source discussion platform. Prior to 2026.1.7, an authenticated user could submit specially formed URLs that bypassed the Onebox allowlist and embedded malicious content in a site. This issue is fixed in versions 2026.1.7, 2026.6.2, 2026.7.1, and 2026.8.0-latest.1.",
"evidence": "osv:CVE-2026-72728",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-72728",
"aliases": [
"BIT-discourse-2026-72728",
"CVE-2026-72728",
"GHSA-qp9j-3v7r-wrvr"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/discourse/discourse",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b6af77c0382ac61817e825e4e285217327772b54"
},
{
"introduced": "06d03da34c4ed09ea59f917f045ba250d2b6320d"
},
{
"fixed": "ac368a8cac47e413b99f122c890e32c133a4bacc"
},
{
"introduced": "ded677e00beb0e9bae6e70b69582aecfb72b5477"
},
{
"fixed": "cbf996f65aae3da1843224aa624bcd9a225931ac"
},
{
"introduced": "fb9247e04a826ab8e4d91168b3c4c839ec40bccc"
},
{
"fixed": "b88e77d40524f929740726615f4c081efa3a405c"
},
{
"fixed": "92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.1.7"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "2026.6.0-latest"
},
{
"fixed": "2026.6.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "2026.7.0-latest"
},
{
"fixed": "2026.7.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "2026.8.0-latest"
},
{
"fixed": "2026.8.0-latest.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2026.1.6",
"v2026.7.0",
"v2026.6.1",
"v2026.8.0-latest",
"_gh-attach-assets",
"v2026.1.5",
"v2026.6.0",
"v2026.7.0-latest",
"v2026.6.0-latest",
"v2026.1.4",
"v2026.1.3",
"v2026.1.2",
"v2026.1.1",
"v2026.1.0",
"stable",
"esr",
"v2026.1.0-latest",
"v2025.12.0-latest",
"v3.6.0.beta2",
"v3.6.0.beta1",
"v3.5.0.beta9",
"v3.5.0.beta8",
"v3.5.0.beta7",
"v3.5.0.beta6",
"v3.5.0.beta5",
"v3.5.0.beta4",
"v3.5.0.beta3",
"v3.5.0.beta2",
"v3.5.0.beta1",
"v3.4.0.beta4",
"v3.4.0.beta3",
"v3.4.0.beta2",
"v3.4.0.beta1",
"v3.3.0.beta5",
"v3.3.0.beta6",
"v3.3.0.beta4",
"v3.3.0.beta3",
"v3.3.0.beta2",
"v3.3.0.beta1",
"v3.2.0.beta5",
"v3.2.0.beta4",
"v3.2.0.beta3",
"v3.2.0.beta2",
"v3.2.0.beta1",
"v3.1.0.beta8",
"v3.1.0.beta7",
"v3.1.0.beta6",
"v3.1.0.beta5",
"v3.1.0.beta4",
"v3.1.0.beta3",
"v3.1.0.beta2",
"v3.1.0.beta1",
"v3.0.0.beta16",
"v3.0.0.beta15",
"v2.9.0.beta14",
"v2.9.0.beta13",
"v2.9.0.beta12",
"v2.9.0.beta11",
"v2.9.0.beta10",
"v2.9.0.beta9",
"v2.9.0.beta8",
"v2.9.0.beta7",
"v2.9.0.beta6",
"v2.9.0.beta5",
"v2.9.0.beta4",
"v2.9.0.beta3",
"v2.9.0.beta2",
"v2.9.0.beta1",
"v2.8.0.beta11",
"v2.8.0.beta10",
"v2.8.0.beta9",
"v2.8.0.beta8",
"v2.8.0.beta7",
"v2.8.0.beta6",
"v2.8.0.beta5",
"v2.8.0.beta4",
"v2.8.0.beta3",
"v2.8.0.beta2",
"v2.8.0.beta1",
"v2.7.0.beta9",
"v2.7.0.beta8",
"v2.7.0.beta7",
"v2.7.0.beta6",
"v2.7.0.beta5",
"v2.7.0.beta4",
"v2.7.0.beta3",
"v2.7.0.beta2",
"v2.7.0.beta1",
"v2.6.0.beta6",
"v2.6.0.beta5",
"v2.6.0.beta4",
"v2.6.0.beta3",
"v2.6.0.beta2",
"v2.6.0.beta1",
"v2.5.0.beta7",
"v2.5.0.beta6",
"v2.5.0.beta5",
"v2.5.0.beta4",
"v2.5.0.beta3",
"v2.5.0.beta2",
"v2.5.0.beta1",
"v2.4.0.beta11",
"v2.4.0.beta10",
"v2.4.0.beta9",
"v2.4.0.beta8",
"v2.4.0.beta7",
"v2.4.0.beta6",
"v2.4.0.beta5",
"v2.4.0.beta4",
"v2.4.0.beta3",
"v2.4.0.beta2",
"v2.4.0.beta1",
"v2.3.0.beta11",
"v2.3.0.beta10",
"v2.3.0.beta9",
"v2.3.0.beta8",
"v2.3.0.beta7",
"v2.3.0.beta6",
"v2.3.0.beta5",
"v2.3.0.beta4",
"v2.3.0.beta3",
"v2.3.0.beta2",
"v2.3.0.beta1",
"v2.2.0.beta10",
"v2.2.0.beta9",
"v2.2.0.beta8",
"v2.2.0.beta7",
"v2.2.0.beta6",
"v2.2.0.beta5",
"v2.2.0.beta4",
"v2.2.0.beta3",
"v2.2.0.beta2",
"v2.2.0.beta1",
"v2.1.0.beta6",
"v2.1.0.beta5",
"v2.1.0.beta4",
"v2.1.0.beta3",
"v2.1.0.beta2",
"v2.1.0.beta1",
"v2.0.0.beta10",
"v2.0.0.beta9",
"v2.0.0.beta8",
"v2.0.0.beta7",
"v2.0.0.beta6",
"v2.0.0.beta5",
"v2.0.0.beta4",
"v2.0.0.beta3",
"v2.0.0.beta2",
"v2.0.0.beta1",
"v1.9.0.beta17",
"v1.9.0.beta16",
"v1.9.0.beta15",
"v1.9.0.beta14",
"v1.9.0.beta13",
"v1.9.0.beta12",
"v1.9.0.beta11",
"v1.9.0.beta10",
"v1.9.0.beta9",
"v1.9.0.beta8",
"v1.9.0.beta7",
"v1.9.0.beta6",
"v1.9.0.beta5",
"v1.9.0.beta4",
"v1.9.0.beta3",
"v1.9.0.beta2",
"v1.9.0.beta1",
"v1.8.0.beta13",
"v1.8.0.beta12",
"v1.8.0.beta11",
"v1.8.0.beta10",
"v1.8.0.beta9",
"v1.8.0.beta8",
"v1.8.0.beta7",
"v1.8.0.beta6",
"v1.8.0.beta5",
"v1.8.0.beta4",
"v1.8.0.beta3",
"v1.8.0.beta2",
"v1.8.0.beta1",
"v1.7.0.beta11",
"v1.7.0.beta10",
"v1.7.0.beta9",
"v1.7.0.beta8",
"v1.7.0.beta7",
"v1.7.0.beta6",
"v1.7.0.beta5",
"v1.7.0.beta4",
"v1.7.0.beta3",
"v1.7.0.beta1",
"v1.7.0.beta2",
"v1.6.0.beta12",
"v1.6.0.beta11",
"v1.6.0.beta10",
"v1.6.0.beta9",
"v1.6.0.beta8",
"v1.6.0.beta7",
"v1.6.0.beta6",
"v1.6.0.beta5",
"v1.6.0.beta4",
"v1.6.0.beta3",
"v1.6.0.beta2",
"v1.6.0.beta1",
"v1.5.0.beta14",
"v1.5.0.beta13b",
"v1.5.0.beta13",
"v1.5.0.beta12",
"v1.5.0.beta11",
"v1.5.0.beta10",
"v1.5.0.beta9",
"v1.5.0.beta8",
"v1.5.0.beta7",
"v1.5.0.beta6",
"v1.5.0.beta5",
"v1.5.0.beta4",
"v1.5.0.beta2",
"v1.5.0.beta1",
"v1.4.0.beta12",
"v1.4.0.beta11",
"v1.4.0.beta10",
"v1.4.0.beta9",
"v1.4.0.beta8",
"v1.4.0.beta7",
"v1.4.0.beta6",
"v1.4.0.beta5",
"v1.4.0.beta4",
"v1.4.0.beta3",
"v1.4.0.beta2",
"v1.4.0.beta1",
"v1.3.0.beta11",
"v1.3.0.beta10",
"v1.3.0.beta9",
"v1.3.0.beta6",
"v1.3.0.beta5",
"v1.3.0.beta4",
"v1.3.0.beta3",
"v1.3.0.beta2",
"v1.3.0.beta1",
"v1.2.0.beta9",
"v1.2.0.beta8",
"v1.2.0.beta7",
"v1.2.0.beta6",
"v1.2.0.beta5",
"v1.2.0.beta4",
"v1.2.0.beta3",
"v1.2.0.beta2",
"v1.2.0.beta1",
"v1.1.0.beta8",
"v1.1.0.beta7",
"v1.1.0.beta6b",
"v1.1.0.beta6",
"v1.1.0.beta5",
"v1.1.0.beta4",
"v1.1.0.beta3",
"v1.1.0.beta2",
"v1.0.0",
"v0.9.9.18",
"v0.9.9.17",
"v0.9.9.16",
"v0.9.9.15",
"v0.9.9.14",
"v0.9.9.13",
"v0.9.9.12",
"v0.9.9.11",
"v0.9.9.10",
"v0.9.9.9",
"v0.9.9.8",
"v0.9.9.7",
"v0.9.9.6",
"v0.9.9.5",
"v0.9.9.4",
"v0.9.9.3",
"v0.9.9.2",
"v0.9.9.1",
"v0.9.8.11",
"v0.9.8.10",
"v0.9.8.9",
"v0.9.8.8",
"v0.9.8.7",
"v0.9.8.6",
"v0.9.8.5",
"v0.9.8.4",
"v0.9.8.3",
"v0.9.8.2",
"v0.9.8.1",
"v0.9.8",
"v0.9.7.9",
"v0.9.7.8",
"v0.9.7.7",
"v0.9.7.6",
"v0.9.7.5",
"v0.9.7.4",
"v0.9.7.3",
"v0.9.7.2",
"v0.9.7.1",
"v0.9.7",
"v0.9.6.4",
"v0.9.6.3",
"v0.9.6.1",
"v0.9.6",
"v0.9.5.2",
"v0.9.5.1",
"v0.9.5",
"v0.9.4",
"v0.9.3",
"v0.9.2.6",
"v0.9.2.5",
"v0.9.2",
"v0.9.1",
"v0.9.0",
"v0.8.9",
"v0.8.8",
"v0.8.7",
"v0.8.6",
"v0.8.5",
"v0.8.4",
"v0.8.3",
"v0.8.2",
"v0.8.1",
"v0.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72728.json"
}
}
],
"modified": "2026-10-28T02:30:37.379603309Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72728.json",
"https://github.com/discourse/discourse/security/advisories/GHSA-qp9j-3v7r-wrvr",
"https://nvd.nist.gov/vuln/detail/CVE-2026-72728",
"https://github.com/discourse/discourse/commit/92eec47e8b477cb8b4ccdb237e26dc1ba8f8b76b"
],
"provider_metadata": {
"cwe_ids": [
"CWE-20"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72728.json"
}
},
"related_cves": [
{
"value": "CVE-2026-72728",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504792,
"published_at": "2026-08-10T16:13:20.965+00:00"
}