Critical
Cal.com Authentication Bypass via bad TOTP + password checks
Type: advisorySources: OSV
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-66489
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 11:39 UTC · Revision 1
Source evidence
Cal.com Authentication Bypass via bad TOTP + password checks
core-osv · Original sourcePublished 3 Dec 2025, 19:44 UTC
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
osv:CVE-2025-66489
Complete source record
{
"id": "e01cfcdfc979cb7aca0d2abaa17139d30881d28c04ebdf6d10a29e9c7ac0de32",
"url": "https://osv.dev/vulnerability/CVE-2025-66489",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Cal.com Authentication Bypass via bad TOTP + password checks",
"summary": "Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.",
"evidence": "osv:CVE-2025-66489",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2025-66489",
"aliases": [
"CVE-2025-66489",
"GHSA-9r3w-4j8q-pw98"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/calcom/cal.diy",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "fd6c6e6419dc4b19f8ec8132cd08d57bdfdaee43"
}
],
"database_specific": {
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{
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},
{
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],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
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}
],
"modified": "2026-10-28T02:30:34.751904330Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66489.json",
"https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98",
"https://nvd.nist.gov/vuln/detail/CVE-2025-66489"
],
"provider_metadata": {
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],
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}
},
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 502109,
"published_at": "2025-12-03T19:44:35.303+00:00"
}