CVE-2026-33538Network attack vector

Service interruption via unindexed authentication-provider queries

Published Mar 24, 2026 · Updated Mar 24, 2026

Denial of service in Parse Server before 8.6.58 and 9.0.0 through 9.6.0-alpha.51 allows remote attackers to interrupt service via auth requests. In Auth.js, findUsersWithAuthData queries the user collection for each attacker-supplied, unconfigured provider name before validation, causing an unindexed full collection scan. No account is required, and parallel requests can saturate database resources and deny backend service without changing or exposing stored data.

CVSS severity8.7
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Parse Server before 8.6.58 and 9.0.0 through 9.6.0-alpha.51 allows remote attackers to interrupt service via auth requests. In Auth.js, findUsersWithAuthData queries the user collection for each attacker-supplied, unconfigured provider name before validation, causing an unindexed full collection scan. No account is required, and parallel requests can saturate database resources and deny backend service without changing or exposing stored data.

The record

CVE
CVE-2026-33538
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=< 8.6.58
  2. Affected versionversion=>= 9.0.0, < 9.6.0-alpha.52

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.58; version=>= 9.0.0, < 9.6.0-alpha.52

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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