Vulnerability in Webpros cpanel-whm-and-wp2-wordpress-square… (CVE-2026-41940, CVSS 9.8, KEV)

Summary

vulnerability in Webpros cpanel-whm-and-wp2-wordpress-squared (CVE-2026-41940). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.

Original description

The description as published by the source.

WebPros cPanel & WHM (WebHost Manager) and WP2 (WordPress Squared) contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.

Source: CISA Known Exploited Vulnerabilities NVD CISA KEV

AI summary

Written by an external AI model and may contain mistakes. Check the original description and references below before acting on it.

A critical authentication bypass vulnerability has been found in WebPros cPanel & WHM and WP2 (WordPress Squared), allowing attackers to access the control panel without authentication. Similar to past vulnerabilities such as "Heartbleed" or "Log4Shell," this issue could be widely exploited, causing significant impacts on systems. Companies should prioritize applying the latest security patches.

In WebPros cPanel & WHM and WP2 (WordPress Squared), an authentication bypass occurs during the login flow. Specific vulnerable endpoints or parameters are not identified, but the issue allows remote unauthenticated attacks. There is no information on affected or fixed versions; however, it is listed in CISA KEV indicating known risk. No specific workarounds are provided, but identifying the vulnerability and verifying patches is crucial.

❓ What is the problem

WebPros cPanel & WHM and WP2 contain an authentication bypass vulnerability in the login flow.

📍 Affected scope

Control panel login flow of WebPros cPanel & WHM and WP2

🔥 Severity

High severity; allows unauthorized access without authentication.

🔧 How to fix

No information on fixes or versions available.

🛡️ Workaround

No detailed workarounds provided.

🔍 Detection

n/a

Related past incidents Similar incidents extracted from past CVEs

Heartbleed

Similar authentication vulnerabilities with widespread impact.

CVE-2019-11043

PHP-FPM vulnerability allowing remote code execution due to lack of proper input validation, similar bypass vector.

If this happens at your company Expected impact per business scenario

📌 Web hosting services using cPanel & WHM or WP2

Unauthenticated attackers could hijack web hosting accounts, modify settings, or disrupt service.

📌 Organizations using WordPress hosting

Websites could be defaced, data stolen, or service interrupted, leading to business losses.

📌 Service providers reselling cPanel & WHM solutions

End customer trust could be eroded leading to potential business contracts loss.

Recommended action

Organizations should immediately assess the exposure to CVE-2026-41940 and apply security patches once released while monitoring official advisories for updates and mitigation strategies.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'cpanel-whm-and-wp2-wordpress-squared' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で cpanel-whm-and-wp2-wordpress-squared を grep し、稼働しているサービス・バージョンを把握する。
4
Consider incident declaration escalate
```
Notify SOC / on-call
```
CISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。
7
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。

[KEV] Vulnerability in Webpros cpanel-whm-and-wp2-wordpress-squared (CVE-2026-41940)