CVE-2026-109303

Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 protectedFields Bypass via Relation Count Query

At a glance

Severity: MEDIUM 5.3
EPSS: EPSS 0.20 % · percentile 10 (2026-10-27)
State: PUBLISHED
Published: 2026-10-12
Updated: 2026-10-13
Assigner: VulnCheck
NVD status: Awaiting Analysis

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.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	VulnCheck
CVSS 4.0	MEDIUM 5.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	NVD · disclosure@vulncheck.com (Secondary)

Weaknesses (CWE)

CWE-639

European references

ENISA EUVD · EUVD-2026-97605
GCVE · GCVE-0-2026-109303

Affected products

Product	Versions
parse-community · parse-server	affected 9.0.0 < 9.10.1-alpha.13 ; unaffected 9.10.1-alpha.13
parse-community · parse-server	affected 0 < 8.6.93 ; unaffected 8.6.93

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD