Security advisory
A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66. When one creates an account, the next step will ask for a username. This field will not save HTML control characters but an error will be displayed that shows the attempted username unescaped via packages/rocketchat-ui-login/client/username/username.js in packages/rocketchat-ui-login/client/username/username.html.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-13879
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 10:26 UTC · Revision 1
Source evidence
A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66. When one creates an account, the next step will ask for a username. This field will not save HTML control characters but an error will be displayed that shows the attempted username unescaped via packages/rocketchat-ui-login/client/username/username.js in packages/rocketchat-ui-login/client/username/username.html.
osv:CVE-2018-13879
Complete source record
{
"id": "16711bae7df3611b44698c61341c8457460a8add62682d1c1b62bf063b172b7f",
"url": "https://osv.dev/vulnerability/CVE-2018-13879",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-13879",
"summary": "A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66. When one creates an account, the next step will ask for a username. This field will not save HTML control characters but an error will be displayed that shows the attempted username unescaped via packages/rocketchat-ui-login/client/username/username.js in packages/rocketchat-ui-login/client/username/username.html.",
"evidence": "osv:CVE-2018-13879",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2018-13879",
"aliases": [
"CVE-2018-13879"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/rocketchat/rocket.chat",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5aa08cba32b468cde6885fb4f7a802d364de2a81"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.66"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"0.65.2",
"0.65.1",
"0.65.0",
"0.64.2",
"0.64.1",
"0.64.0",
"0.63.3",
"0.63.2",
"0.63.1",
"0.63.0",
"0.62.2",
"0.62.1",
"0.62.0",
"0.61.2",
"0.61.1",
"0.61.0",
"0.60.4",
"0.60.3",
"0.60.2",
"0.60.1",
"0.60.0",
"0.59.6",
"0.59.5",
"0.59.4",
"0.59.3",
"0.59.2",
"0.59.1",
"0.59.0",
"0.58.2",
"0.58.1",
"0.58.0",
"0.57.2",
"0.57.1",
"0.57.0",
"0.56.0",
"0.56.0-rc.7",
"0.56.0-rc.6",
"0.56.0-rc.5",
"0.56.0-rc.4",
"0.56.0-rc.3",
"0.56.0-rc.2",
"0.56.0-rc.1",
"0.56.0-rc.0",
"0.54.1",
"0.54.0",
"0.50.0",
"0.49.4",
"0.49.3",
"0.49.2",
"0.49.1",
"0.49.0",
"0.48.0",
"0.46.0",
"0.45.0",
"0.44.0",
"0.43.0",
"0.42.0",
"0.41.0",
"0.40.1",
"0.40.0",
"0.39.0",
"0.38.0",
"0.37.1",
"0.37.0",
"0.36.0",
"0.30.0",
"0.29.0",
"0.28.0",
"0.27.0",
"0.26.0",
"0.25.0",
"0.24.0",
"0.23.0",
"0.19.0",
"0.18.0",
"0.17.0",
"0.16.0",
"0.15.0",
"0.14.0",
"0.13.0",
"0.11.0",
"0.10.2",
"0.10.1",
"0.10.0",
"0.8.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-13879.json"
}
}
],
"modified": "2026-10-20T10:50:18.910910432Z",
"provider": "osv",
"references": [
"https://github.com/RocketChat/Rocket.Chat/issues/10795"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2018-13879",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 381520,
"published_at": "2018-07-11T01:29:01.55+00:00"
}