{"id":"CVE-2026-39321","state":"PUBLISHED","title":"Parse Server has a login timing side-channel reveals user existence","description":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74.","publishedAt":"2026-04-07T18:11:10.514Z","updatedAt":"2026-04-07T19:58:57.199Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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":">= 9.0.0, < 9.8.0-alpha.6","status":"affected"},{"version":"< 8.6.74","status":"affected"}]}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v","https://github.com/parse-community/parse-server/pull/10398","https://github.com/parse-community/parse-server/pull/10399"],"weaknesses":["CWE-208"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/39xxx/CVE-2026-39321.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39321","state":"PUBLISHED","datePublished":"2026-04-07T18:11:10.514Z","dateUpdated":"2026-04-07T19:58:57.199Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-06T19:31:07.266Z"},"containers":{"cna":{"title":"Parse Server has a login timing side-channel reveals user existence","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 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74."}],"affected":[{"vendor":"parse-community","product":"parse-server","versions":[{"version":">= 9.0.0, < 9.8.0-alpha.6","status":"affected"},{"version":"< 8.6.74","status":"affected"}]}],"references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v","name":"https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/parse-community/parse-server/pull/10398","name":"https://github.com/parse-community/parse-server/pull/10398","tags":["x_refsource_MISC"]},{"url":"https://github.com/parse-community/parse-server/pull/10399","name":"https://github.com/parse-community/parse-server/pull/10399","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-208","lang":"en","description":"CWE-208: Observable Timing Discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-07T18:11:10.514Z"},"source":{"advisory":"GHSA-mmpq-5hcv-hf2v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-07T18:44:58.116800Z","id":"CVE-2026-39321","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-07T19:58:57.199Z"}}]}}}