MEDIUM CVSS 6.9
Published: 2026-04-14

CVE-2026-37980

redhat build_of_keycloak Security Advisory (CVE-2026-37980)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2026-37980 impacting redhat build_of_keycloak. Evaluated with CVSS Base Score of 6.9 (MEDIUM).

Original NVD Description

Source: NIST NVD
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 v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries
Attack Complexity
Low (AC:L)
No specialized conditions required
Privileges Required
High (PR:H)
Administrative credentials required
User Interaction
Required (UI:R)
User must click or open resource
Scope
Changed (S:C)
Impacts components beyond caller authority
Confidentiality
High (C:H)
Total information disclosure
Integrity
Low (I:L)
Partial data modification possible
Availability
None (A:N)
No system availability impact

🎯 Affected Versions Matrix

Affected Product redhat / build_of_keycloak
Affected Versions -
Weakness Enumeration CWE-79

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2026-37980 impacting redhat build_of_keycloak.

⚡ Nuclei Detection Template (YAML) cve-2026-37980.yaml
id: cve-2026-37980

info:
  name: redhat build_of_keycloak - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: medium
  description: |
    Automated signature & scanner for CVE-2026-37980 affecting redhat build_of_keycloak.
    Evaluation: A flaw was found in Keycloak, specifically in the organization selection login page. A remote attacker with `manage-realm` or `manage-organizations` a...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2026-37980
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
    cvss-score: 6.9
    cve-id: CVE-2026-37980
    cwe-id: CWE-79
  tags: cve,cve-2026-37980,redhat,build_of_keycloak,medium

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "build_of_keycloak"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2026-37980.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2026-37980
# Target: redhat build_of_keycloak | CVSS: 6.9 (MEDIUM)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2026-37980 (redhat build_of_keycloak)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against redhat build_of_keycloak scope (-).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2026-37980.sh
# Recommended Remediation & Patching Commands for CVE-2026-37980
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install build_of_keycloak 2>/dev/null || \
sudo dnf upgrade build_of_keycloak 2>/dev/null || \
sudo yum update build_of_keycloak

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i build_of_keycloak 2>/dev/null || rpm -qa | grep -i build_of_keycloak

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

🔗 Verified Technical References

Authorities
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Technical Analysis
  • No records filed in this category.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2026-37980 in redhat build_of_keycloak?

Review vendor-specific security notices and update redhat build_of_keycloak packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2026-37980?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2026-37980?

CVE-2026-37980 is classified with a CVSS 3.1 Base Score of 6.9 (MEDIUM). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
6.9
MEDIUM SEVERITY
CVE ID CVE-2026-37980
Weakness CWE-79
Vendor redhat
Product build_of_keycloak
Published 2026-04-14
Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N