What’s Vulnerable › Vulnerabilities

CVE-2026-33323: Parse Server: Email verification resend page leaks user existence

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-24 · updated 2026-06-17
• Weakness: CWE-204

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.51 and 9.6.0-alpha.40, the Pages route and legacy PublicAPI route for resending email verification links return distinguishable responses depending on whether the provided username exists and has an unverified email. This allows an unauthenticated attacker to enumerate valid usernames by observing different redirect targets. The existing emailVerifySuccessOnInvalidEmail configuration option, which is enabled by default and protects the API route against this, did not apply to these routes. This issue has been patched in versions 8.6.51 and 9.6.0-alpha.40.

Affected products

• parse-community parse-server: before 8.6.51; from 9.0.0 before 9.6.0; 9.6.0-alpha1, 9.6.0-alpha10, 9.6.0-alpha11, 9.6.0-alpha12, 9.6.0-alpha13, 9.6.0-alpha14 (+33) — fixed in 8.6.51, 9.6.0

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.51, 9.6.0. Check the vendor advisory for mitigations.

References

• https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5
• https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3
• https://github.com/parse-community/parse-server/pull/10238
• https://github.com/parse-community/parse-server/pull/10243
• https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f

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