CVE-2026-118539: Drupal Commerce Core Authorization Bypass Actively Exploited — Detection and Remediation Guide

---
title: Unauthenticated Access to Drupal Commerce Order Administration Routes
id: 4f7c2a91-8d3e-4b6a-9f21-7c5e1a3d8b02
status: experimental
description: Detects successful HTTP requests to Drupal Commerce Core order administration routes, which should never be reachable without authenticated admin sessions. A key indicator of CVE-2026-118539 missing-authorization exploitation.
references:
  - https://thehackernews.com/2026/10/hackers-actively-exploit-highly.html
  - https://cwe.mitre.org/data/definitions/862.html
author: Security Arsenal
date: 2026/10/22
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: webserver
  product: apache
detection:
  selection_uri:
    cs-uri|contains:
      - '/admin/commerce/orders'
      - '/admin/commerce/order'
      - '/admin/commerce/store'
  selection_status:
    sc-status: 200
  condition: all of selection_*
falsepositives:
  - Legitimate commerce administrators (filter by known admin source IPs and correlate with authenticated Drupal sessions)
level: high
---
title: Suspicious POST Activity Against Drupal Commerce Cart and Checkout Endpoints
id: 8b3d6f42-1e7a-4c5b-a2d9-6f4c8e1b3a07
status: experimental
description: Detects high-volume or anomalous POST requests against Drupal Commerce cart and checkout routes from a single source, consistent with automated exploitation of the CVE-2026-118539 missing authorization flaw.
references:
  - https://thehackernews.com/2026/10/hackers-actively-exploit-highly.html
  - https://cwe.mitre.org/data/definitions/862.html
author: Security Arsenal
date: 2026/10/22
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: webserver
  product: apache
detection:
  selection_uri:
    cs-uri|contains:
      - '/cart/add'
      - '/checkout'
      - '/cart'
  selection_method:
    cs-method: 'POST'
  filter_scanner:
    cs-user-agent|contains:
      - 'sqlmap'
      - 'nikto'
      - 'nuclei'
      - 'curl/'
      - 'python-requests'
      - 'Go-http-client'
  condition: selection_uri and selection_method and filter_scanner
falsepositives:
  - Legitimate API-driven storefront integrations using scripted HTTP clients (whitelist known integration user-agents)
level: medium
---
title: Drupal Commerce Order Entity Access Via REST or JSON:API Without Session
id: 2c9e4b71-5a8f-4d3c-b6e2-9a1f7d4c5e08
status: experimental
description: Detects requests to Drupal REST/JSON:API order entity endpoints, an exploitation path for missing authorization flaws in Commerce Core where order data is exposed to anonymous users (CVE-2026-118539).
references:
  - https://thehackernews.com/2026/10/hackers-actively-exploit-highly.html
  - https://cwe.mitre.org/data/definitions/862.html
author: Security Arsenal
date: 2026/10/22
tags:
  - attack.collection
  - attack.t1213
logsource:
  category: webserver
  product: apache
detection:
  selection:
    cs-uri|contains:
      - '/jsonapi/commerce_order'
      - '/jsonapi/order'
      - '/entity/commerce_order'
      - '/order/' 
    cs-uri-query|contains:
      - '_format=json'
      - '_format=hal_json'
  condition: selection
falsepositives:
  - Headless/decoupled storefronts legitimately consuming JSON:API (validate against expected consumer IPs and tokens)
level: medium

// Hunt for potential CVE-2026-118539 exploitation in web logs ingested via CEF/Syslog
// Scope: requests to Commerce Core sensitive routes, grouped by source to find unauthenticated probing
let CommerceRoutes = dynamic(["/admin/commerce/orders", "/admin/commerce/order", "/admin/commerce/store", "/cart", "/checkout", "/jsonapi/commerce_order"]);
union isfuzzy=true (CommonSecurityLog, Syslog)
| where TimeGenerated > ago(30d)
| extend Uri = coalesce(RequestURL, column_ifexists("RequestURL", ""), extract(@"GET\s+([^\s]+)", 1, tostring(SyslogMessage)), extract(@"POST\s+([^\s]+)", 1, tostring(SyslogMessage)))
| extend Method = coalesce(RequestMethod, extract(@"^(GET|POST|PUT|DELETE|PATCH)", 1, tostring(SyslogMessage)))
| extend StatusCode = toint(coalesce(column_ifexists("ReceivedBytes", 0), 0)) // placeholder guard
| where Uri has_any (CommerceRoutes)
| extend SourceIP = coalesce(SourceIP, extract(@"(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})", 1, tostring(SyslogMessage)))
| summarize RequestCount = count(),
            DistinctUris = dcount(Uri),
            Methods = make_set(Method),
            FirstSeen = min(TimeGenerated),
            LastSeen = max(TimeGenerated),
            SampleUris = make_set(Uri, 10)
  by SourceIP, bin(TimeGenerated, 1h)
| where RequestCount > 25 or DistinctUris > 3
| order by RequestCount desc;

-- Artifact: Drupal_Commerce_AuthBypass_WeblogHunt
-- Purpose: Parse web server access logs for requests hitting Commerce Core
-- sensitive routes, flagging successful access to order admin paths and
-- high-frequency cart/checkout POSTs consistent with CVE-2026-118539 exploitation.

LET logs <= SELECT FullPath
FROM glob(globs=[
  '/var/log/apache2/access*.log*',
  '/var/log/nginx/access*.log*',
  '/var/log/httpd/access*_log*',
  '/var/log/nginx/*/access*.log*'
])
WHERE NOT FullPath =~ '\\.gz$'

LET hits <= SELECT FullPath, Line,
  parse_string_with_regex(string=Line,
    regex='(?P<SrcIP>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}).*?"(?P<Method>[A-Z]+) (?P<Uri>[^ ]+).*?" (?P<Status>\\d{3})') AS Parsed
FROM foreach(row=logs,
  query={
    SELECT FullPath, Line
    FROM parse_lines(filename=FullPath)
    WHERE Line =~ '/admin/commerce|/checkout|/cart|/jsonapi/commerce_order'
  })

SELECT FullPath,
       Parsed.SrcIP AS SourceIP,
       Parsed.Method AS Method,
       Parsed.Uri AS Uri,
       Parsed.Status AS Status,
       count() AS HitCount
FROM hits
WHERE Status =~ '^2'
GROUP BY SourceIP, Uri, Status, FullPath
ORDER BY HitCount DESC

#!/bin/bash
# CVE-2026-118539 - Drupal Commerce Core remediation & exposure verification
# Run on the web host (or via CI against the codebase) with appropriate privileges.
set -euo pipefail

DOCROOT="${1:-/var/www/html}"
cd "$DOCROOT"

echo "=== [1] Identify installed Commerce Core version ==="
if command -v composer >/dev/null 2>&1; then
  composer show drupal/commerce 2>/dev/null | grep -E '^versions' || true
fi
drush status 2>/dev/null | grep -i 'drupal version' || true

COMMERCE_VER=$(composer show drupal/commerce 2>/dev/null | awk '/^versions/{print $4}')
echo "Installed drupal/commerce version: ${COMMERCE_VER:-UNKNOWN}"

# Affected: <= 2.41 (2.x branch) and 3.0.0 - 3.3.13 (3.x branch)
if [[ "${COMMERCE_VER}" =~ ^2\. ]] || [[ "${COMMERCE_VER}" =~ ^3\. ]]; then
  echo "[!] Potentially affected branch detected. Verify exact version against the Drupal security advisory."
fi

echo "=== [2] Apply the security update ==="
# Pull the latest patched Commerce Core release for your branch, then run DB updates.
composer update drupal/commerce --with-dependencies
drush updatedb -y
drush cache:rebuild

echo "=== [3] Verify patched version ==="
composer show drupal/commerce | grep -E '^versions'

echo "=== [4] Hunt access logs for pre-patch exploitation ==="
for LOG in /var/log/apache2/access*.log /var/log/nginx/access*.log /var/log/httpd/access*_log; do
  [ -f "$LOG" ] || continue
  echo "--- $LOG ---"
  grep -E '(/admin/commerce|/jsonapi/commerce_order|/entity/commerce_order)' "$LOG" | grep -E '" (200|302)' | tail -n 50 || true
  echo "--- High-frequency cart/checkout POST sources ---"
  grep -E 'POST /(cart|checkout)' "$LOG" | awk '{print $1}' | sort | uniq -c | sort -rn | head -n 20 || true
done

echo "=== [5] Optional hardening: block unauthenticated access to commerce admin routes at the edge ==="
echo "Add WAF/nginx rules denying anonymous traffic to /admin/commerce/* while allowing authenticated staff IPs only."

echo "=== Done. Review log output above and escalate any suspicious 200s to IR. ==="