{"id":"CVE-2026-39321","summary":"Parse Server has a login timing side-channel reveals user existence","details":"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.","aliases":["BIT-parse-2026-39321","GHSA-mmpq-5hcv-hf2v"],"modified":"2026-07-08T08:13:02.171533821Z","published":"2026-04-07T18:11:10.514Z","database_specific":{"cwe_ids":["CWE-208"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39321.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39321.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-mmpq-5hcv-hf2v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39321"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10398"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10399"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/parse-community/parse-server","events":[{"introduced":"0"},{"fixed":"4b6966106f83cda4d074135a85236622d84777d1"},{"introduced":"532a461d30a6ed4457839f2caf5f30d5abf51a55"},{"fixed":"7c3b43d2633cfe96a5bd1e853b84fa34846a03bd"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"8.6.74"},{"introduced":"9.0.0"},{"fixed":"9.8.0"}],"cpe":"cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*","source":"CPE_RANGE"}}],"versions":["9.7.0","8.6.73","8.6.72","8.6.71","8.6.70","9.6.1","8.6.69","8.6.68","8.6.67","8.6.66","8.6.65","8.6.64","8.6.63","8.6.62","9.6.0","9.5.1","8.6.61","8.6.60","8.6.59","8.6.58","8.6.57","8.6.56","8.6.55","8.6.54","8.6.53","8.6.52","8.6.51","8.6.50","8.6.49","8.6.48","8.6.47","8.6.46","8.6.45","8.6.44","8.6.43","8.6.42","8.6.41","8.6.40","8.6.39","8.6.38","8.6.37","8.6.36","8.6.35","8.6.34","8.6.33","8.6.32","8.6.31","8.6.30","8.6.29","8.6.28","8.6.27","8.6.26","8.6.25","8.6.24","8.6.23","8.6.22","8.6.21","8.6.20","8.6.19","8.6.18","8.6.17","8.6.16","8.6.15","8.6.14","8.6.13","9.5.0","8.6.12","8.6.11","9.4.1","8.6.10","8.6.9","8.6.8","8.6.7","8.6.6","8.6.5","8.6.4","9.4.0","8.6.3","9.3.1","9.3.0","8.6.2","9.2.0","9.1.1","9.1.0","8.6.1","9.0.0","8.6.0","8.5.0","8.4.0","8.3.0","8.2.5","8.2.4","8.2.3","8.2.2","8.2.1","8.2.0","8.1.0","8.0.2","8.0.1","8.0.0","7.4.0","7.3.0","7.2.0","7.1.0","7.0.0","6.4.0","6.3.1","6.3.0","6.2.2","6.2.1","6.2.0","6.1.0","6.0.0","5.4.0","5.3.3","5.3.2","5.3.1","5.3.0","5.2.8","5.2.7","5.2.6","5.2.5","5.2.4","5.2.3","5.2.2","5.2.1","5.2.0","5.1.1","5.1.0","5.0.0","5.0.0-alpha.1","4.5.0","4.4.0","4.3.0","4.2.0","4.1.0","4.0.2","4.0.1","4.0.0","3.10.0","3.9.0","3.8.0","3.7.2","3.7.1","3.7.0","3.6.0","3.5.0","3.4.0","3.4.1","3.3.0","3.2.3","3.2.2","3.2.1","3.2.0","3.1.3","3.1.2","3.1.1","3.1.0","3.0.0","2.8.2","2.8.0","2.7.4","2.7.3","2.7.2","2.7.1","2.7.0","2.6.5","2.6.4","2.6.3","2.6.2","2.6.1","2.6.0","2.5.3","2.5.2","2.5.1","2.5.0","2.4.2","2.4.1","2.4.0","2.3.8","2.3.7","2.3.6","2.3.5","2.3.4","2.3.3","2.3.2","2.3.1","2.2.25","2.2.25-beta.1","2.2.24","2.2.23","2.2.22","2.2.21","2.2.20","2.2.19","2.2.18","2.2.17","2.2.16","2.2.15","2.2.14","2.2.13","2.2.12","2.2.11","2.2.10","2.2.9","2.2.8","2.2.7","2.2.6","2.2.5","2.2.4","2.2.3","2.2.2","2.2.1","2.2.0","2.1.6","2.1.5","2.1.4","2.1.3","2.1.2","2.1.1","2.1.0","2.0.8","2.0.7","2.0.3","2.0.6","2.0.5","2.0.4","2.0.2","2.0.1","2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39321.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}