CVE-2026-33323Network attack vector

Username enumeration via distinct resend redirects

Published Mar 24, 2026 · Updated Mar 24, 2026

Observable response discrepancy in Parse Server before 8.6.51 and 9.0.0 through 9.6.0-alpha.39 allows remote attackers to enumerate valid usernames. PagesRouter and the legacy PublicAPI resend route returned success for existing unverified users but a distinct failure redirect for unknown users because they ignored the default emailVerifySuccessOnInvalidEmail option. Exploitation is unauthenticated but requires an exposed resend route and candidate usernames; disclosure is limited to account existence and unverified-email state.

CVSS severity6.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable response discrepancy in Parse Server before 8.6.51 and 9.0.0 through 9.6.0-alpha.39 allows remote attackers to enumerate valid usernames. PagesRouter and the legacy PublicAPI resend route returned success for existing unverified users but a distinct failure redirect for unknown users because they ignored the default emailVerifySuccessOnInvalidEmail option. Exploitation is unauthenticated but requires an exposed resend route and candidate usernames; disclosure is limited to account existence and unverified-email state.

The record

CVE
CVE-2026-33323
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-204, T1087
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=< 8.6.51
  2. Affected versionversion=>= 9.0.0, < 9.6.0-alpha.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.51; version=>= 9.0.0, < 9.6.0-alpha.40

Published CVSS scores

6.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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