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Vulnerability details: VCID-6s7u-6b3m-3kfn
Vulnerability ID VCID-6s7u-6b3m-3kfn
Aliases CVE-2021-20323
GHSA-xpgc-j48j-jwv9
Summary Cross-site Scripting in Keycloak A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak version 15. The issue was fixed in version 17.0.0.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20323.json
epss 0.65362 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.66054 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.66054 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
epss 0.7008 https://api.first.org/data/v1/epss?cve=CVE-2021-20323
cvssv3.1 6.1 https://bugzilla.redhat.com/show_bug.cgi?id=2013577
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=2013577
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-xpgc-j48j-jwv9
cvssv3.1 6.1 https://github.com/keycloak/keycloak
generic_textual MODERATE https://github.com/keycloak/keycloak
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-20323
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-20323
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-20323
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20323.json
https://api.first.org/data/v1/epss?cve=CVE-2021-20323
https://bugzilla.redhat.com/show_bug.cgi?id=2013577
https://github.com/keycloak/keycloak
https://nvd.nist.gov/vuln/detail/CVE-2021-20323
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
GHSA-xpgc-j48j-jwv9 https://github.com/advisories/GHSA-xpgc-j48j-jwv9
RHSA-2022:0407 https://access.redhat.com/errata/RHSA-2022:0407
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://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20323.json
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://bugzilla.redhat.com/show_bug.cgi?id=2013577
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/keycloak/keycloak
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: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-20323
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
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-2021-20323
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 0.98417
EPSS Score 0.65362
Published At Aug. 3, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:04:06.616082+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-xpgc-j48j-jwv9/GHSA-xpgc-j48j-jwv9.json 37.0.0