Medium
better-auth before 1.1.16 Reflected XSS via error parameter
Type: advisorySources: OSV
better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-71404
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:41 UTC · Revision 1
Source evidence
better-auth before 1.1.16 Reflected XSS via error parameter
core-osv · Original sourcePublished 1 Aug 2026, 12:22 UTC
better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.
osv:CVE-2025-71404
Complete source record
{
"id": "06bb9a1c58c9e5e189719f23b74c3e7165469097f42455ce058ddb568d562c2e",
"url": "https://osv.dev/vulnerability/CVE-2025-71404",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "better-auth before 1.1.16 Reflected XSS via error parameter",
"summary": "better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.",
"evidence": "osv:CVE-2025-71404",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-71404",
"aliases": [
"CVE-2025-71404",
"GHSA-9x4v-xfq5-m8x5"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/better-auth/better-auth",
"type": "GIT",
"events": [
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{
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"database_specific": {
"extracted_events": [
{
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{
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"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
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{
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"source": "REFERENCES_COMMIT"
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}
}
],
"modified": "2026-10-28T02:30:49.064522401Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71404.json",
"https://github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5",
"https://nvd.nist.gov/vuln/detail/CVE-2025-71404",
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"https://github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c"
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],
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}
},
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{
"value": "CVE-2025-71404",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517445,
"published_at": "2026-08-01T12:22:17.885+00:00"
}