High
Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user
Type: advisorySources: OSV
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 and 9.5.0-alpha.4, the readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected. This issue has been patched in versions 8.6.6 and 9.5.0-alpha.4.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-30229
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 03:57 UTC · Revision 1
Source evidence
Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user
core-osv · Original sourcePublished 6 Mar 2026, 20:26 UTC
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 and 9.5.0-alpha.4, the readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected. This issue has been patched in versions 8.6.6 and 9.5.0-alpha.4.
osv:CVE-2026-30229
Complete source record
{
"id": "4b10f2b12c0e178e2547d81d31d0b9b4285d575761494fc08f3b855033756bf8",
"url": "https://osv.dev/vulnerability/CVE-2026-30229",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user",
"summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 and 9.5.0-alpha.4, the readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected. This issue has been patched in versions 8.6.6 and 9.5.0-alpha.4.",
"evidence": "osv:CVE-2026-30229",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-30229",
"aliases": [
"BIT-parse-2026-30229",
"CVE-2026-30229",
"GHSA-79wj-8rqv-jvp5"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/parse-community/parse-server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "0994d6e9b8bb76635eecaba7ed49b1563f329a3e"
},
{
"introduced": "532a461d30a6ed4457839f2caf5f30d5abf51a55"
},
{
"fixed": "f0e3f32401da07b835a5487adb62c69e06ec3f8e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "8.6.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "9.0.0"
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{
"last_affected": "9.4.1"
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],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "0994d6e9b8bb76635eecaba7ed49b1563f329a3e"
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],
"source": "REFERENCES_TAG",
"original_tag": "8.6.6"
},
{
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}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30229.json"
}
}
],
"modified": "2026-10-28T02:30:26.074852314Z",
"provider": "osv",
"references": [
"https://github.com/parse-community/parse-server/releases/tag/8.6.6",
"https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30229.json",
"https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5",
"https://nvd.nist.gov/vuln/detail/CVE-2026-30229"
],
"provider_metadata": {
"cwe_ids": [
"CWE-863"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30229.json"
}
},
"related_cves": [
{
"value": "CVE-2026-30229",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492314,
"published_at": "2026-03-06T20:26:53.787+00:00"
}