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Vulnerability details: VCID-quer-e8mx-eyg2
Vulnerability ID VCID-quer-e8mx-eyg2
Aliases CVE-2021-21422
GHSA-7p8h-86p5-wv3p
Summary Cross-site Scripting mongo-express is a web-based MongoDB admin interface, written with Node.js and express.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.01294 https://api.first.org/data/v1/epss?cve=CVE-2021-21422
cvssv3.1 8.1 https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b
generic_textual HIGH https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b
cvssv3.1 8.1 https://github.com/mongo-express/mongo-express/issues/577
generic_textual HIGH https://github.com/mongo-express/mongo-express/issues/577
cvssv3.1 8.1 https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3p
generic_textual HIGH https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3p
cvssv3.1 8.1 https://nvd.nist.gov/vuln/detail/CVE-2021-21422
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-21422
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-21422
https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b
https://github.com/mongo-express/mongo-express/issues/577
https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3p
CVE-2021-21422 https://nvd.nist.gov/vuln/detail/CVE-2021-21422
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Found at https://github.com/mongo-express/mongo-express/commit/f5e0d4931f856f032f22664b5e5901d5950cfd4b
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:R/S:U/C:H/I:H/A:N Found at https://github.com/mongo-express/mongo-express/issues/577
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:R/S:U/C:H/I:H/A:N Found at https://github.com/mongo-express/mongo-express/security/advisories/GHSA-7p8h-86p5-wv3p
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:R/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-21422
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 0.80022
EPSS Score 0.01294
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:21:33.653900+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/mongo-express/CVE-2021-21422.yml 38.6.0