{"id":"CVE-2026-33538","state":"PUBLISHED","title":"Parse Server: Denial of service via unindexed database query for unconfigured auth providers","description":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52.","publishedAt":"2026-03-24T18:24:51.595Z","updatedAt":"2026-03-24T18:37:24.020Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["parse-community parse-server"],"affected":[{"vendor":"parse-community","product":"parse-server","versions":[{"version":"< 8.6.58","status":"affected"},{"version":">= 9.0.0, < 9.6.0-alpha.52","status":"affected"}]}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr","https://github.com/parse-community/parse-server/pull/10270","https://github.com/parse-community/parse-server/pull/10271","https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357","https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33538.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33538","state":"PUBLISHED","datePublished":"2026-03-24T18:24:51.595Z","dateUpdated":"2026-03-24T18:37:24.020Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-20T18:05:11.831Z"},"containers":{"cna":{"title":"Parse Server: Denial of service via unindexed database query for unconfigured auth providers","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 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52."}],"affected":[{"vendor":"parse-community","product":"parse-server","versions":[{"version":"< 8.6.58","status":"affected"},{"version":">= 9.0.0, < 9.6.0-alpha.52","status":"affected"}]}],"references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr","name":"https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/parse-community/parse-server/pull/10270","name":"https://github.com/parse-community/parse-server/pull/10270","tags":["x_refsource_MISC"]},{"url":"https://github.com/parse-community/parse-server/pull/10271","name":"https://github.com/parse-community/parse-server/pull/10271","tags":["x_refsource_MISC"]},{"url":"https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357","name":"https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357","tags":["x_refsource_MISC"]},{"url":"https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54","name":"https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-24T18:24:51.595Z"},"source":{"advisory":"GHSA-g4cf-xj29-wqqr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-24T18:37:14.649898Z","id":"CVE-2026-33538","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-24T18:37:24.020Z"}}]}}}