CVE-2026-33323: Parse server Parse Server Email Verification Resend Vulnerability
MODERATECVE-2026-33323 is a MODERATE (CVSS 5.3) parse server email verification resend vulnerability (CWE-204: Observable Response Discrepancy) affecting Parse server libraries in the npm ecosystem. The issue involves parse server email verification resend page leaks user existence. Remediation is available by upgrading affected packages to version 9.6.0-alpha.40, 8.6.51.
CVE-2026-33323 at a Glance
Security Impact
CVSS: 5.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2026-33323
To remediate this vulnerability, upgrade all affected Parse server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install parse-server@9.6.0-alpha.40npm install parse-server@8.6.51Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls parse-serverHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-33323, inspect your project dependencies using npm:
npm ls parse-serverAnalyze the terminal output to locate any version of Parse server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.6.0-alpha.40), your application is affected.
Note: The npm ls parse-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-204: Observable Response Discrepancy, where the product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. In Parse server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-33323 Affected Parse server Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
parse-server
|
npm |
≥ 9.0.0
< 9.6.0-alpha.40
|
9.6.0-alpha.40
|
|
parse-server
|
npm |
< 8.6.51
|
8.6.51
|
References
Frequently Asked Questions
What is CVE-2026-33323?
Which Parse server versions are affected?
What version fixes CVE-2026-33323?
Is parse-server affected?
What is the CVSS score of CVE-2026-33323?
What CWE is associated with CVE-2026-33323?
How can I check npm dependencies for CVE-2026-33323?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-h29g-q5c2-9h4f",
"modified" : "2026-03-30T13:51:06Z",
"published" : "2026-03-19T18:21:18Z",
"aliases" : [ "CVE-2026-33323" ],
"summary" : "Parse Server email verification resend page leaks user existence",
"details" : "### Impact\n\nThe 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.\n\n### Patches\n\nThe email verification resend routes now respect the `emailVerifySuccessOnInvalidEmail` option. When set to `true` (the default), both routes redirect to the success page regardless of the outcome, preventing user enumeration.\n\n### Workarounds\n\nThere is no known workaround to prevent the information disclosure other than upgrading.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}, {
"type" : "CVSS_V4",
"score" : "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" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "parse-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "9.0.0"
}, {
"fixed" : "9.6.0-alpha.40"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "parse-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "8.6.51"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33323"
}, {
"type" : "WEB",
"url" : "https://github.com/parse-community/parse-server/pull/10238"
}, {
"type" : "WEB",
"url" : "https://github.com/parse-community/parse-server/pull/10243"
}, {
"type" : "WEB",
"url" : "https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5"
}, {
"type" : "WEB",
"url" : "https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/parse-community/parse-server"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-204" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-19T18:21:18Z",
"nvd_published_at" : "2026-03-24T19:16:52Z"
}
}