CVE-2026-33323

Parse Server: Email verification resend page leaks user existence

CVSS 6.3 MEDIUMEPSS 0.3%CWE-204

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

24 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

parse-community · parse-server

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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