CVE-2026-33042Network attack vector

Unauthenticated session creation via empty authData

Published Mar 18, 2026 · Updated Mar 18, 2026

Authentication bypass in Parse Server before 8.6.49 and 9.0.0 through 9.6.0-alpha.28 allows remote attackers to create credentialless sessions. RestWrite treated the presence of authData as provider credentials, so an empty object bypassed username and password enforcement and reached session issuance. Any client able to reach signup can create an authenticated user and session without a valid identity, even when anonymous users are disabled.

CVSS severity6.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Parse Server before 8.6.49 and 9.0.0 through 9.6.0-alpha.28 allows remote attackers to create credentialless sessions. RestWrite treated the presence of authData as provider credentials, so an empty object bypassed username and password enforcement and reached session issuance. Any client able to reach signup can create an authenticated user and session without a valid identity, even when anonymous users are disabled.

The record

CVE
CVE-2026-33042
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-287, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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=< 8.6.49
  2. Affected versionversion=>= 9.0.0, < 9.6.0-alpha.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.49; version=>= 9.0.0, < 9.6.0-alpha.29

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1136Create Account

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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