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Vulnerability details: VCID-5r6k-dvae-pkd8
Vulnerability ID VCID-5r6k-dvae-pkd8
Aliases CVE-2021-42648
GHSA-2gp3-6c9p-jp7w
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Cross-site scripting (XSS) vulnerability exists in Coder Code-Server before 3.12.0, allows attackers to execute arbitrary code via crafted URL.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
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 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
epss 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
epss 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
epss 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
epss 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
epss 0.00398 https://api.first.org/data/v1/epss?cve=CVE-2021-42648
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-2gp3-6c9p-jp7w
cvssv3.1 6.1 https://github.com/cdr/code-server/issues/4355
generic_textual MODERATE https://github.com/cdr/code-server/issues/4355
cvssv3.1 6.1 https://github.com/coder/code-server
generic_textual MODERATE https://github.com/coder/code-server
cvssv3.1 6.1 https://github.com/coder/code-server/pull/4430
generic_textual MODERATE https://github.com/coder/code-server/pull/4430
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-42648
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-42648
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-42648
https://github.com/cdr/code-server/issues/4355
https://github.com/coder/code-server
https://github.com/coder/code-server/pull/4430
CVE-2021-42648 https://nvd.nist.gov/vuln/detail/CVE-2021-42648
GHSA-2gp3-6c9p-jp7w https://github.com/advisories/GHSA-2gp3-6c9p-jp7w
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/cdr/code-server/issues/4355
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:C/C:L/I:L/A:N Found at https://github.com/coder/code-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:R/S:C/C:L/I:L/A:N Found at https://github.com/coder/code-server/pull/4430
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:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-42648
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 0.60898
EPSS Score 0.00398
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:42:29.416593+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/code-server/CVE-2021-42648.yml 38.6.0