CVE-2026-33323 Parse Server: Email verification resend page leaks user existence
Unauthenticated attackers can enumerate valid usernames by observing distinguishable responses from email verification resend routes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33323?
CVE-2026-33323 is a medium-severity vulnerability in Parseplatform Parse-Server, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-204
Which versions are affected by CVE-2026-33323?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.51 |
parse-server npm | All versions | 8.6.51 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.40 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.40 |
parse Bitnami | All versions | 8.6.51, 9.6.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-33323?
Upgrade parse-server to a fixed version for your release line: 8.6.51 or 9.6.0-alpha.40.
Is CVE-2026-33323 being exploited?
There is no known exploitation of CVE-2026-33323 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-33323, GHSA-h29g-q5c2-9h4f.