CVE-2026-33323 (GCVE-0-2026-33323)

Vulnerability from cvelistv5 – Published: 2026-03-24 18:06 – Updated: 2026-03-25 14:28
VLAI?
Title
Parse Server: Email verification resend page leaks user existence
Summary
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.
Severity ?
6.3 (Medium)
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
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
parse-community parse-server Affected: < 8.6.51
Affected: >= 9.0.0, < 9.6.0-alpha.40
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33323\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-25T13:56:28.643271Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-25T13:56:57.910Z\"}}], \"cna\": {\"title\": \"Parse Server: Email verification resend page leaks user existence\", \"source\": {\"advisory\": \"GHSA-h29g-q5c2-9h4f\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 6.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"LOW\"}}], \"affected\": [{\"vendor\": \"parse-community\", \"product\": \"parse-server\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 8.6.51\"}, {\"status\": \"affected\", \"version\": \"\u003e= 9.0.0, \u003c 9.6.0-alpha.40\"}]}], \"references\": [{\"url\": \"https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f\", \"name\": \"https://github.com/parse-community/parse-server/security/advisories/GHSA-h29g-q5c2-9h4f\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/parse-community/parse-server/pull/10238\", \"name\": \"https://github.com/parse-community/parse-server/pull/10238\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/parse-community/parse-server/pull/10243\", \"name\": \"https://github.com/parse-community/parse-server/pull/10243\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5\", \"name\": \"https://github.com/parse-community/parse-server/commit/967aa57732202009b2389ce9ecb3130d53d657e5\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3\", \"name\": \"https://github.com/parse-community/parse-server/commit/fbda4cb0c5cbc8fad08a216823b6b64d4ae289c3\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-204\", \"description\": \"CWE-204: Observable Response Discrepancy\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-24T18:06:32.189Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33323\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-25T14:28:34.748Z\", \"dateReserved\": \"2026-03-18T21:23:36.677Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-24T18:06:32.189Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.