CVE-2026-33323

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.

PUBLISHED Reserved 2026-03-18 | Published 2026-03-24 | Updated 2026-03-25 | Assigner GitHub_M

Problem types

CWE-204: Observable Response Discrepancy

Product status

References

github.com/...server/security/advisories/GHSA-h29g-q5c2-9h4f

github.com/parse-community/parse-server/pull/10238

github.com/parse-community/parse-server/pull/10243

github.com/...ommit/967aa57732202009b2389ce9ecb3130d53d657e5

github.com/...ommit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3

cve.org (CVE-2026-33323)

nvd.nist.gov (CVE-2026-33323)

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