High 8.5Published Mar 6, 2026

CVE-2026-30229Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user

Updated under an hour ago (Oct 27, 2026, 6:00 AM ET)

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It affects parse-community parse-server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for parse-community parse-server

Exploited in the last 30 days

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.

CVSS: 8.5 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

parse-community parse-server parse_community:parse_server (from the name)	before 8.6.6; before 9.5.0-alpha.4	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.6; from 9.0.0 through 9.4.1; 9.5.0; 9.5.0; 9.5.0	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5	x-refsource-confirm, vendor-advisory
https://github.com/parse-community/parse-server/releases/tag/8.6.6	x-refsource-misc, product, release-notes
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.