Vulnerability details

CVE-2026-30229

parse-community parse-server

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

CVSS 4.0

8.5High

Official description

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 scores

Score	Version	Source	Vector
8.5High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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 products

Vendor	Product	Versions	Source
parse-community	parse-server	< 8.6.6	CVEProject cvelistV5 (CNA)
parse-community	parse-server	< 9.5.0-alpha.4	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5 x_refsource_CONFIRM
https://github.com/parse-community/parse-server/releases/tag/8.6.6 x_refsource_MISC
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4 x_refsource_MISC

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Details

Published: 2026-03-06
Last updated: 2026-03-10
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.42%

Probability of exploitation in 30 days

37.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-863
Incorrect Authorization