{"id":"CVE-2026-109303","title":"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 Relatio…","summary":"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 Relatio…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-639"],"published":"2026-10-12","updated":"2026-10-13","sourceUpdated":"2026-10-13T20:39:48.767","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109303","references":[{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-rmhf-xv62-rm99","label":"disclosure@vulncheck.com"},{"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","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00204,"epssPercentile":0.1033,"ingestedAt":"2026-10-12T18:00:08.195Z","vendor":"parse-community","product":"parse-server","affected":["parse-server >= 9.0.0 < 9.10.1-alpha.13","parse-server < 8.6.93"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-13T15:59:53.723277Z"},"slug":"CVE-2026-109303","body":"## Overview\n\nParse 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}