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Vulnerability details: VCID-xpsb-2yux-g3cf
Vulnerability ID VCID-xpsb-2yux-g3cf
Aliases CVE-2021-20683
GHSA-v9w8-hq92-v39m
Summary Cross-site Scripting Improper neutralization of JavaScript input in the blog article editing function of baserCMS allows remote authenticated attackers to inject an arbitrary script via unspecified vectors.
Status Published
Exploitability None
Weighted Severity None
Risk None
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 0.00203 https://api.first.org/data/v1/epss?cve=CVE-2021-20683
cvssv3.1 5.4 https://basercms.net/security/JVN64869876
generic_textual MODERATE https://basercms.net/security/JVN64869876
cvssv3.1 5.4 https://github.com/baserproject/basercms/commit/88ccc61e5656b05dd13204d61de706efaa2cd0b1
generic_textual MODERATE https://github.com/baserproject/basercms/commit/88ccc61e5656b05dd13204d61de706efaa2cd0b1
cvssv3.1 5.4 https://jvn.jp/en/jp/JVN64869876/index.html
generic_textual MODERATE https://jvn.jp/en/jp/JVN64869876/index.html
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2021-20683
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-20683
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-20683
https://basercms.net/security/JVN64869876
https://github.com/baserproject/basercms/commit/88ccc61e5656b05dd13204d61de706efaa2cd0b1
https://jvn.jp/en/jp/JVN64869876/index.html
CVE-2021-20683 https://nvd.nist.gov/vuln/detail/CVE-2021-20683
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://basercms.net/security/JVN64869876
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:L/UI:R/S:C/C:L/I:L/A:N Found at https://github.com/baserproject/basercms/commit/88ccc61e5656b05dd13204d61de706efaa2cd0b1
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:L/UI:R/S:C/C:L/I:L/A:N Found at https://jvn.jp/en/jp/JVN64869876/index.html
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:L/UI:R/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20683
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 0.42327
EPSS Score 0.00203
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T16:20:57.206461+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/baserproject/basercms/CVE-2021-20683.yml 38.6.0