{"id":"CVE-2026-39321","revision":"a35e4ca5ae3544749a1c8665e708dc90","records":[{"revision":"a35e4ca5ae3544749a1c8665e708dc90","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-39321","aliases":[],"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.","state":0,"publishedAt":"2026-04-07T18:11:10.514+00:00","modifiedAt":"2026-04-07T19:58:57.199+00:00","affected":[{"ecosystem":"Vendor product","name":"parse-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"parse-community\",\n                    \"product\": \"parse-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 9.0.0, < 9.8.0-alpha.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 8.6.74\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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","score":6.3,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-39321","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-39321","identifiers":["CVE-2026-39321"]},"retained":false,"historicalAffected":[]}],"coverage":[]}