Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33323Parse Server: Email verification resend page leaks user existence
Medium 6.3
In plain English
A medium-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.40 | GHSA-h29g-q5c2-9h4f |
| npm | parse-server | 8.6.51 | GHSA-h29g-q5c2-9h4f |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.51>= 9.0.0, < 9.6.0-alpha.40 |
Weakness: CWE-204 · 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
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10238 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10243 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3 x_refsource_MISC