Critical
OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header
Type: advisorySources: OSV
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers to access project data belonging to other tenants, read sensitive User fields via nested relations, leak plaintext resetPasswordToken, and reset the victim’s password and fully take over the account. This results in cross‑tenant data exposure and full account takeover. This vulnerability is fixed in 10.0.21.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-30956
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:35 UTC · Revision 1
Source evidence
OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header
core-osv · Original sourcePublished 10 Mar 2026, 16:56 UTC
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers to access project data belonging to other tenants, read sensitive User fields via nested relations, leak plaintext resetPasswordToken, and reset the victim’s password and fully take over the account. This results in cross‑tenant data exposure and full account takeover. This vulnerability is fixed in 10.0.21.
osv:CVE-2026-30956
Complete source record
{
"id": "55d902a4f2ac33ac99a82eb6f56939068b1538522552ee27ce39c25c4ee5b94e",
"url": "https://osv.dev/vulnerability/CVE-2026-30956",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header",
"summary": "OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers to access project data belonging to other tenants, read sensitive User fields via nested relations, leak plaintext resetPasswordToken, and reset the victim’s password and fully take over the account. This results in cross‑tenant data exposure and full account takeover. This vulnerability is fixed in 10.0.21.",
"evidence": "osv:CVE-2026-30956",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-30956",
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"GHSA-r5v6-2599-9g3m"
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
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}
],
"modified": "2026-10-28T02:30:37.640371998Z",
"provider": "osv",
"references": [
"https://github.com/OneUptime/oneuptime/releases/tag/10.0.21",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30956.json",
"https://github.com/OneUptime/oneuptime/security/advisories/GHSA-r5v6-2599-9g3m",
"https://nvd.nist.gov/vuln/detail/CVE-2026-30956"
],
"provider_metadata": {
"cwe_ids": [
"CWE-285",
"CWE-862"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30956.json"
}
},
"related_cves": [
{
"value": "CVE-2026-30956",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504760,
"published_at": "2026-03-10T16:56:29.018+00:00"
}