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cPanel has patched CVE-2026-65643, a critical flaw in cPanel & WebHost Manager (WHM) domain-parking and addon-domain functionality. A low-privileged authenticated hosting account authorized to add parked or addon domains can create arbitrary files on the underlying server, potentially leading to code execution as root and full control of the host.
The issue affects all supported cPanel & WHM release branches, with fixes issued for 11.110, 11.134, 11.136, and 11.138, including WP Squared. Shared and reseller-hosting operators should apply the relevant patched build immediately; systems on end-of-life branches must be upgraded to a supported release, and unpatched deployments should restrict parked- and addon-domain permissions. cPanel had not disclosed a CVSS score, detection guidance, interim mitigation, or confirmed in-the-wild exploitation.
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The CVE-2026-65643 record was received by support@hackerone.com. The record characterizes the flaw as CWE-95 eval injection in cPanel 11.138.0.0 and earlier, allowing a low-privileged authenticated remote attacker to execute code as root, with a high-impact CVSS v4 vector.
The Canadian Centre for Cyber Security published advisory AV26-861 for CVE-2026-65643, advising cPanel and WHM administrators to review the vendor advisory and apply available updates. The advisory identified affected releases prior to the fixed versions across the 11.110, 11.134, 11.136, 11.138, and WP2 branches.
As of August 28, the CVE Program record store had no published record for CVE-2026-65643, and cPanel had not said whether the flaw was exploited in the wild. The vulnerability was also absent from CISA's Known Exploited Vulnerabilities catalog as of the prior day.
cPanel published a customer advisory for CVE-2026-65643, a critical domain-parking and addon-domain flaw affecting all supported cPanel & WHM versions. An authenticated account permitted to add parked or addon domains could create arbitrary server files and potentially execute code as root; cPanel released fixes for the 11.110, 11.134, 11.136, 11.138, and WP Squared branches.
Benin’s bjCSIRT published a notice concerning the cPanel & WHM domain-parking functionality vulnerability associated with CVE-2026-65643.
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WebPros cPanel disclosed and patched a critical authentication bypass flaw in **cPanel & WHM** and **WP Squared**, now tracked as `CVE-2026-41940` with a **CVSS 9.8** score. The bug affects all supported cPanel & WHM versions after `11.40` prior to fixed releases, and reporting indicates some unsupported versions are likely vulnerable as well. Researchers said the issue stems from improper session handling tied to a **CRLF injection** in the login flow, allowing unauthenticated remote attackers to poison session data and gain administrator or root-level access to exposed hosting control panels. cPanel released emergency updates across supported branches, published detection guidance, and advised administrators to force updates, restart `cpsrvd`, and investigate session files and logs for signs of compromise. Multiple sources reported the flaw was **actively exploited in the wild** before patches were issued, with hosting providers such as **Namecheap** and **KnownHost** taking emergency action by restricting access to management ports like `2083` and `2087` while deploying fixes. **CISA** added `CVE-2026-41940` to its **Known Exploited Vulnerabilities** catalog and ordered federal agencies to remediate quickly, while national cyber agencies in Canada, Austria, and Belgium also warned of the risk. Public technical analysis, proof-of-concept code, and exploit tooling released after disclosure increased the likelihood of broad opportunistic attacks against internet-exposed cPanel systems, which researchers estimated number in the hundreds of thousands to more than a million, raising the risk of website compromise, credential theft, ransomware, phishing, and multi-tenant hosting breaches.
Sep 3, 2026
cPanel disclosed and patched **CVE-2026-58048**, a critical privilege-escalation flaw in **cPanel & WHM** that allows an authenticated user with **MySQL** or **MariaDB** access to execute arbitrary SQL commands with full database administrator privileges. The bug, rated **CVSS 9.4**, affects all supported cPanel & WHM versions and **WP Squared**, and stems from the database rename process failing to preserve SQL mode correctly, enabling escalation into the database root context. The company warned that in some shared-hosting, database, and operating-system configurations, the flaw could extend beyond database control to **OS-level compromise** and potentially full server takeover. cPanel said customers should upgrade immediately to fixed releases; if patching is delayed, administrators should temporarily revoke the MySQL feature from cPanel users and review database audit logs for suspicious administrative activity. **CISA** said no active exploitation had been observed and classified the issue as non-automatable despite its severe technical impact.
Aug 5, 2026
cPanel disclosed and patched a critical authentication bypass in cPanel & WHM, tracked as **`CVE-2026-41940`**, after reports of active in-the-wild exploitation against hosting infrastructure. The flaw affects authentication paths in supported versions and can let unauthenticated attackers reach administrative interfaces, forge authenticated sessions, and potentially gain control of hosted websites, databases, email accounts, and server configuration. Government and industry alerts warned that shared hosting environments face outsized risk because a single compromised server can expose many downstream customer sites, and some providers temporarily restricted cPanel and WHM login ports while applying fixes. Public technical analysis and a GitHub proof-of-concept described an exploit chain involving manipulated HTTP headers and session cookie handling to create forged privileged sessions, including possible root-level WHM access. Separately, cPanel also patched three additional vulnerabilities in cPanel & WHM and **WP Squared**—**`CVE-2026-29201`**, **`CVE-2026-29202`**, and **`CVE-2026-29203`**—that enable arbitrary file read through path traversal, Perl code injection leading to remote code execution, and denial-of-service via unsafe symlink handling. The most severe of the newly disclosed flaws, **`CVE-2026-29202`**, affects the `create_user` API and can allow arbitrary Perl code execution on the server, reinforcing calls for immediate upgrades, restricted access to management interfaces, and log review for suspicious authorization and cookie activity.
Jun 29, 2026