HIGH CVSS 8.7
Published: 2026-04-15

CVE-2026-35569

apostrophecms apostrophecms Security Advisory (CVE-2026-35569)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2026-35569 impacting apostrophecms apostrophecms. Evaluated with CVSS Base Score of 8.7 (HIGH).

Original NVD Description

Source: NIST NVD
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including <title> tags, <meta> attributes, and JSON-LD structured data. An attacker can inject a payload such as "></title><script>alert(1)</script> to break out of the intended HTML context and execute arbitrary JavaScript in the browser of any authenticated user who views the affected page. This can be leveraged to perform authenticated API requests, access sensitive data such as usernames, email addresses, and roles via internal APIs, and exfiltrate it to an attacker-controlled server. This issue has been fixed in version 4.29.0.

📊 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
Low (PR:L)
Standard user access 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
High (I:H)
Total modification of target system
Availability
None (A:N)
No system availability impact

🎯 Affected Versions Matrix

Affected Product apostrophecms / apostrophecms
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-2026-35569 impacting apostrophecms apostrophecms.

⚡ Nuclei Detection Template (YAML) cve-2026-35569.yaml
id: cve-2026-35569

info:
  name: apostrophecms apostrophecms - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: high
  description: |
    Automated signature & scanner for CVE-2026-35569 affecting apostrophecms apostrophecms.
    Evaluation: ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SE...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2026-35569
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
    cvss-score: 8.7
    cve-id: CVE-2026-35569
    cwe-id: CWE-79
  tags: cve,cve-2026-35569,apostrophecms,apostrophecms,high

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "apostrophecms"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2026-35569.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2026-35569
# Target: apostrophecms apostrophecms | CVSS: 8.7 (HIGH)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2026-35569 (apostrophecms apostrophecms)...")
    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 apostrophecms apostrophecms 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-2026-35569.sh
# Recommended Remediation & Patching Commands for CVE-2026-35569
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install apostrophecms 2>/dev/null || \
sudo dnf upgrade apostrophecms 2>/dev/null || \
sudo yum update apostrophecms

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

# 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.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2026-35569 in apostrophecms apostrophecms?

Review vendor-specific security notices and update apostrophecms apostrophecms 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-2026-35569?

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-2026-35569?

CVE-2026-35569 is classified with a CVSS 3.1 Base Score of 8.7 (HIGH). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
8.7
HIGH SEVERITY
CVE ID CVE-2026-35569
Weakness CWE-79
Vendor apostrophecms
Product apostrophecms
Published 2026-04-15
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N