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Vulnerability details: VCID-r9jq-4te8-xkfb
Vulnerability ID VCID-r9jq-4te8-xkfb
Aliases CVE-2026-34595
GHSA-mmg8-87c5-jrc2
Summary Parse Server has a LiveQuery protected-field guard bypass via array-like logical operator value ### Impact An authenticated user with `find` class-level permission can bypass the `protectedFields` class-level permission setting on LiveQuery subscriptions. By sending a subscription with a `$or`, `$and`, or `$nor` operator value as a plain object with numeric keys and a `length` property (an "array-like" object) instead of an array, the protected-field guard is bypassed. The subscription event firing acts as a binary oracle, allowing the attacker to infer whether a protected field matches a given test value. ### Patches The fix validates that `$or`, `$and`, and `$nor` operator values are arrays in the LiveQuery subscription handler, the query depth checker, and the protected-field guard. As defense in depth, the LiveQuery query evaluator also rejects non-array values for these operators. ### Workarounds There is no known workaround.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2026-34595
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2026-34595
epss 0.0004 https://api.first.org/data/v1/epss?cve=CVE-2026-34595
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-mmg8-87c5-jrc2
cvssv4 5.3 https://github.com/parse-community/parse-server
generic_textual MODERATE https://github.com/parse-community/parse-server
cvssv4 5.3 https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
generic_textual MODERATE https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
ssvc Track https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
cvssv4 5.3 https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
generic_textual MODERATE https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
ssvc Track https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
cvssv4 5.3 https://github.com/parse-community/parse-server/pull/10350
generic_textual MODERATE https://github.com/parse-community/parse-server/pull/10350
ssvc Track https://github.com/parse-community/parse-server/pull/10350
cvssv4 5.3 https://github.com/parse-community/parse-server/pull/10351
generic_textual MODERATE https://github.com/parse-community/parse-server/pull/10351
ssvc Track https://github.com/parse-community/parse-server/pull/10351
cvssv3.1_qr MODERATE https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
cvssv4 5.3 https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
generic_textual MODERATE https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
ssvc Track https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-34595
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-34595
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-34595
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
https://github.com/parse-community/parse-server/pull/10350
https://github.com/parse-community/parse-server/pull/10351
https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
https://nvd.nist.gov/vuln/detail/CVE-2026-34595
GHSA-mmg8-87c5-jrc2 https://github.com/advisories/GHSA-mmg8-87c5-jrc2
No exploits are available.
Vector: 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 Found at https://github.com/parse-community/parse-server
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: 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 Found at https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T17:22:23Z/ Found at https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
Vector: 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 Found at https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T17:22:23Z/ Found at https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
Vector: 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 Found at https://github.com/parse-community/parse-server/pull/10350
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T17:22:23Z/ Found at https://github.com/parse-community/parse-server/pull/10350
Vector: 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 Found at https://github.com/parse-community/parse-server/pull/10351
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T17:22:23Z/ Found at https://github.com/parse-community/parse-server/pull/10351
Vector: 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 Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T17:22:23Z/ Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-34595
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.10713
EPSS Score 0.00035
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:52:02.924287+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mmg8-87c5-jrc2/GHSA-mmg8-87c5-jrc2.json 38.6.0