CVE-2021-20323
Cross-site Scripting in Keycloak
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
- Record
CVE-2021-20323- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
- Record
CVE-2021-20323- Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2022-1588 No score
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
- Record
EUVD-2022-1588- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xpgc-j48j-jwv9
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.
- Record
GHSA-xpgc-j48j-jwv9- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.
- Record
CVE-2021-20323- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-xpgc-j48j-jwv9
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.
- Record
GHSA-xpgc-j48j-jwv9- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.keycloak:keycloak-coreMaven |
15.0.0 up to 17.0.0 | 17.0.0 |
org.keycloak:keycloak-coreMaven |
15.0.0 up to 17.0.0, plus listed versions 15.0.115.0.215.1.015.1.116.0.016.1.016.1.1 |
17.0.0 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | ndmalc/CVE-2021-20323 | 2022-12-07 |
| PoC in GitHub | Cappricio-Securities/CVE-2021-20323 | 2024-01-11 |
| PoC in GitHub | cscpwn0sec/CVE-2021-20323 | 2024-07-07 |
| Nuclei | Keycloak 10.0.0 - 18.0.0 - Cross-Site Scripting |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploits, facts | ||
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, Nuclei, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20323 is a medium vulnerability (CVSS 6.1) in Redhat Keycloak, published March 25, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 37.2%, the 98th percentile. Fixed in org.keycloak:keycloak-core 17.0.0.