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vuln-cve/data/2026/33xxx/CVE-2026-33543.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-33543",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-03-20T18:05:11.832Z",
"datePublished": "2026-06-24T21:01:16.544Z",
"dateUpdated": "2026-06-25T13:22:14.263Z"
},
"containers": {
"cna": {
"title": "FOSSBilling: Authentication bypass allows unauthenticated administrator creation",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-288",
"lang": "en",
"description": "CWE-288: Authentication Bypass Using an Alternate Path or Channel",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-306",
"lang": "en",
"description": "CWE-306: Missing Authentication for Critical Function",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"version": "4.0"
}
}
],
"references": [
{
"name": "https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-28mh-j262-q49w",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-28mh-j262-q49w"
},
{
"name": "https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.0"
}
],
"affected": [
{
"vendor": "FOSSBilling",
"product": "FOSSBilling",
"versions": [
{
"version": "< 0.8.0",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-06-24T21:01:16.544Z"
},
"descriptions": [
{
"lang": "en",
"value": "FOSSBilling is a free, open-source billing and client management system. Versions 0.7.2 and prior expose a guest API endpoint, /api/guest/staff/create, intended for initial administrator bootstrap. Due to a flawed admin-existence check, the endpoint remains usable after an administrator already exists. The flawed guard check uses is_countable() on a value that returns a Model_Admin object or null rather than a countable type, causing the expression to always evaluate as true and bypass the intended protection. As a result, an attacker can reach the unprotected endpoint to create a new administrator account and immediately authenticate, gaining a fully privileged admin session even when an admin already exists. This issue has been fixed in version 0.8.0."
}
],
"source": {
"advisory": "GHSA-28mh-j262-q49w",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-25T13:22:04.810298Z",
"id": "CVE-2026-33543",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-06-25T13:22:14.263Z"
}
}
]
}
}