Medium severity · published Mar 24, 2026
CVE-2026-33323
Parse Server: Email verification resend page leaks user existence
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
< 8.6.51; >= 9.0.0, < 9.6.0-alpha.40 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33323
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33323
Patch
https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5
Patch
https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3
Issue Tracking
https://github.com/parse-community/parse-server/pull/10238
Issue Tracking
https://github.com/parse-community/parse-server/pull/10243
Vendor Advisory
https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f
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