{"id":"CVE-2026-109303","published":"2026-10-12T17:17:24.237","lastModified":"2026-10-13T20:39:48.767","description":"Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce identity-scoped protectedFields (authenticated, role, or per-user groups) on count queries using the $relatedTo operator, exposing the size of protected Relation fields. An authenticated user who can read the owning object can combine counts with an objectId constraint as a membership oracle to reveal confidential memberships such as private groups or block lists.","cvssScore":4.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-rmhf-xv62-rm99","tags":[]},{"url":"https://www.vulncheck.com/advisories/parse-server-before-8.6.93-and-9.0.0-before-9.10.1-alpha.13-protectedfields-bypass-via-relation-count-query","tags":[]}],"exploitRefs":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-rmhf-xv62-rm99","tags":[]}],"hasPoc":true,"ai":null}