6.9

CVE-2026-37980: redhat build_of_keycloak Cross-site Scripting

CVSS: 6.9v3.1MediumAnalyzed
AliasesCGA-277r-7cmh-pw5vCGA-m5px-f9cq-7h98CGA-rqpp-6qc9-rgxp
Published 14-04-2026Last modified 14-04-2026
Open JSON

Vulnerability summary

CVE-2026-37980 is a medium (CVSS 6.9) Cross-site Scripting vulnerability in redhat build_of_keycloak. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 31% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2026
    PublishedVulnerability first disclosed.
  2. 14-04-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in Keycloak, specifically in the organization selection login page. A remote attacker with `manage-realm` or `manage-organizations` administrative privileges can exploit a Stored Cross-Site Scripting (XSS) vulnerability. This flaw occurs because the `organization.alias` is placed into an inline JavaScript `onclick` handler, allowing a crafted JavaScript payload to execute in a user's browser when they view the login page. Successful exploitation enables arbitrary JavaScript execution, potentially leading to session theft, unauthorized account actions, or further attacks against users of the affected realm.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.16 pp

From 0.23% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
  • keycloak-fips-26.4All versions (No fix recorded)
  • keycloak-fips-26.4-iamguarded-fipsAll versions (No fix recorded)
  • request-9047-keycloak-fips-26.4All versions (No fix recorded)
Wolfi2 products
  • keycloak-26.4All versions (No fix recorded)
  • keycloak-26.4-iamguarded-compatAll versions (No fix recorded)
Org.keycloak1 product
  • keycloak-services≤ 26.5.5
Redhat1 product

4 vendors · 10 products

References

5 links