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Vulnerability details: VCID-gje7-sy9t-pbcz
Vulnerability ID VCID-gje7-sy9t-pbcz
Aliases CVE-2021-39187
GHSA-xqp8-w826-hh6x
Summary Improper Handling of Exceptional Conditions Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Parse Server crashes if a query request contains an invalid value for the `explain` option. This is due to a bug in the MongoDB Node.js driver which throws an exception that Parse Server cannot catch.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (5)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-755 Improper Handling of Exceptional Conditions
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-20 Improper Input Validation
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
System Score Found at
epss 0.0066 https://api.first.org/data/v1/epss?cve=CVE-2021-39187
epss 0.0066 https://api.first.org/data/v1/epss?cve=CVE-2021-39187
epss 0.0066 https://api.first.org/data/v1/epss?cve=CVE-2021-39187
epss 0.0066 https://api.first.org/data/v1/epss?cve=CVE-2021-39187
epss 0.0066 https://api.first.org/data/v1/epss?cve=CVE-2021-39187
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-xqp8-w826-hh6x
cvssv3.1 7.5 https://github.com/parse-community/parse-server
generic_textual HIGH https://github.com/parse-community/parse-server
cvssv3.1 7.5 https://github.com/parse-community/parse-server/commit/308668c89474223e2448be92d6823b52c1c313ec
generic_textual HIGH https://github.com/parse-community/parse-server/commit/308668c89474223e2448be92d6823b52c1c313ec
cvssv3.1 7.5 https://github.com/parse-community/parse-server/releases/tag/4.10.3
generic_textual HIGH https://github.com/parse-community/parse-server/releases/tag/4.10.3
cvssv3.1 7.5 https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x
cvssv3.1_qr HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x
generic_textual HIGH https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x
cvssv3.1 7.5 https://jira.mongodb.org/browse/NODE-3463
generic_textual HIGH https://jira.mongodb.org/browse/NODE-3463
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-39187
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-39187
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-39187
https://github.com/parse-community/parse-server
https://github.com/parse-community/parse-server/commit/308668c89474223e2448be92d6823b52c1c313ec
https://github.com/parse-community/parse-server/releases/tag/4.10.3
https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x
https://jira.mongodb.org/browse/NODE-3463
CVE-2021-39187 https://nvd.nist.gov/vuln/detail/CVE-2021-39187
GHSA-xqp8-w826-hh6x https://github.com/advisories/GHSA-xqp8-w826-hh6x
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/parse-community/parse-server
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/parse-community/parse-server/commit/308668c89474223e2448be92d6823b52c1c313ec
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/parse-community/parse-server/releases/tag/4.10.3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/parse-community/parse-server/security/advisories/GHSA-xqp8-w826-hh6x
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://jira.mongodb.org/browse/NODE-3463
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-39187
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.71495
EPSS Score 0.0066
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:39:58.987216+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/parse-server/CVE-2021-39187.yml 38.6.0