Medium
Security advisory
Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-37633
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:19 UTC · Revision 1
Source evidence
Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
osv:CVE-2021-37633
Complete source record
{
"id": "9ed90252e542d129af4a1b6206c7f6c363b2150ff7927503d4b8ad9ea6c3e415",
"url": "https://osv.dev/vulnerability/CVE-2021-37633",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-37633",
"summary": "Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.",
"evidence": "osv:CVE-2021-37633",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-37633",
"aliases": [
"BIT-discourse-2021-37633",
"CVE-2021-37633",
"GHSA-v3v8-3m5w-pjp9"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/discourse/discourse",
"type": "GIT",
"events": [
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{
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"range": [
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{
"fixed": "2.7.8"
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"source": "CPE_RANGE"
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{
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"range": [
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{
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:*",
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{
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"source": "REFERENCES_COMMIT"
}
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}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-37633.json"
}
}
],
"modified": "2026-10-20T10:53:51.185946677Z",
"provider": "osv",
"references": [
"https://github.com/discourse/discourse/security/advisories/GHSA-v3v8-3m5w-pjp9",
"https://github.com/discourse/discourse/commit/38199424bc840d2ef002cd1e9bffdbb99191eb47"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-37633",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 384690,
"published_at": "2021-08-09T20:15:07.597+00:00"
}