CVE-2026-30229Network attack vector

User impersonation via missing read-only key check

Published Mar 6, 2026 · Updated Mar 6, 2026

Incorrect authorization in Parse Server before 8.6.6 and 9.0.0 through 9.5.0-alpha.3 allows remote authenticated users to impersonate users. The UsersRouter loginAs handler accepts readOnlyMasterKey authentication without checking req.auth.isReadOnly before issuing a session token. A deployment must configure readOnlyMasterKey; possession of that credential and a target user ID grants full read and write access to that user's data.

CVSS severity8.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Parse Server before 8.6.6 and 9.0.0 through 9.5.0-alpha.3 allows remote authenticated users to impersonate users. The UsersRouter loginAs handler accepts readOnlyMasterKey authentication without checking req.auth.isReadOnly before issuing a session token. A deployment must configure readOnlyMasterKey; possession of that credential and a target user ID grants full read and write access to that user's data.

The record

CVE
CVE-2026-30229
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.6.6
  2. Affected versionversion=< 9.5.0-alpha.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.6; version=< 9.5.0-alpha.4

Published CVSS scores

6.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.5GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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