Skip to content
Fencer Vulns
medium 6.1

CVE-2021-20323 json

Cross-site Scripting in Keycloak

published 2022-03-25 4 y ago modified 2026-06-17 4 mo ago also GHSA-xpgc-j48j-jwv9 , EUVD-2022-1588

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
37.2%
EPSS 37.2% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak.

Patch / fix

  • maven org.keycloak:keycloak-core 17.0.0
  • redhat keycloak 17.0.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-20323 updated cvss 6.1

keycloak-services: POST based reflected Cross Site Scripting vulnerability

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

37.25% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Keycloak 10.0.0 - 18.0.0 - Cross-Site Scripting nuclei detection template

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-core
>=15.0.0, <17.0.0
17.0.0

Affected products

  • n/a keycloak-services

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.