Medium
Stored DOM-based XSS (without CSP) via video placeholders in Discourse
Type: advisorySources: OSV
Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-22602
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 01:15 UTC · Revision 1
Source evidence
Stored DOM-based XSS (without CSP) via video placeholders in Discourse
core-osv · Original sourcePublished 4 Feb 2025, 20:51 UTC
Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP.
osv:CVE-2025-22602
Complete source record
{
"id": "c9d25bb9550aa4517bcb76a56e760dd560320f16cabbbeee5dde461e3c40596b",
"url": "https://osv.dev/vulnerability/CVE-2025-22602",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Stored DOM-based XSS (without CSP) via video placeholders in Discourse",
"summary": "Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP.",
"evidence": "osv:CVE-2025-22602",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-22602",
"aliases": [
"BIT-discourse-2025-22602",
"CVE-2025-22602",
"GHSA-jcjx-694p-c5m3"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/discourse/discourse",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "fa235e49e92d75f431d1e1ad020c88027fc00c1f"
},
{
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{
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{
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],
"database_specific": {
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{
"cpe": "cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*",
"range": [
{
"introduced": "0"
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{
"fixed": "3.3.4"
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],
"source": "CPE_RANGE"
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{
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{
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"source": "CPE_RANGE"
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{
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{
"cpe": "cpe:2.3:a:discourse:discourse:3.4.0:beta2:*:*:beta:*:*:*",
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{
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{
"cpe": "cpe:2.3:a:discourse:discourse:3.4.0:beta3:*:*:beta:*:*:*",
"range": [
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{
"last_affected": "3.4.0-beta3"
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"source": "CPE_STRING"
}
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}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22602.json"
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}
],
"modified": "2026-10-28T02:30:32.616884065Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22602.json",
"https://github.com/discourse/discourse/security/advisories/GHSA-jcjx-694p-c5m3",
"https://nvd.nist.gov/vuln/detail/CVE-2025-22602"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22602.json"
}
},
"related_cves": [
{
"value": "CVE-2025-22602",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 499417,
"published_at": "2025-02-04T20:51:56.909+00:00"
}