Critical cPanel Authentication Vulnerability Identified — Update Your Server Immediately

Summary

cPanel has released security updates to address a critical authentication vulnerability that affects all currently supported versions of cPanel and WebHost Manager (WHM), allowing attackers to gain unauthorized access to control panels. Namecheap disclosed that the issue relates to an authentication login exploit and temporarily blocked TCP ports 2083 and 2087 as a precautionary measure. The vulnerability has been patched in versions 11.110.0.97, 11.118.0.63, 11.126.0.54, 11.132.0.29, 11.136.0.5, and 11.134.0.20.

Full text

Critical cPanel Authentication Vulnerability Identified — Update Your Server Immediately Ravie LakshmananApr 29, 2026Vulnerability / Web Hosting cPanel has released security updates to address a security issue impacting various authentication paths that could allow an attacker to obtain access to the control panel software. The problem affects all currently supported versions of cPanel and WebHost Manager (WHM), according to an alert published by WebPros on Tuesday. It does not have an official identifier. The issue has been addressed in the following versions - 11.110.0.97 11.118.0.63 11.126.0.54 11.132.0.29 11.136.0.5 11.134.0.20 "If your server is not running a supported version of cPanel that is eligible for this update, it is highly recommended that you work toward updating your server as soon as possible, as it may also be affected," cPanel noted. While cPanel did not share any details about the vulnerability, web hosting and domain registration company Namecheap disclosed that it "relates to an authentication login exploit that could allow unauthorized access to the control panel." As a precautionary measure, the company has applied a firewall rule to block access to TCP ports 2083 and 2087, a move it said will temporarily restrict customer access to their cPanel and WHM interfaces until a full patch is applied. "Our team is actively monitoring the situation and will apply the official patch across all supported servers as soon as it becomes available," Namecheap noted. "Access to your control panels will be restored immediately once the patch has been successfully deployed." As of April 29, 2026, 02:42 a.m. UTC, the fix has been applied to Reseller, Stellar Business servers, and the rest, according to the Namecheap Support Team. Found this article interesting? Follow us on Google News, Twitter and LinkedIn to read more exclusive content we post. SHARE     Tweet Share Share Share SHARE  Authentication, cPanel, cybersecurity, Firewall, Namecheap, network security, Patch Management, server security, Vulnerability, web hosting Trending News Harvester Deploys Linux GoGra Backdoor in South Asia Using Microsoft Graph API Malicious KICS Docker Images and VS Code Extensions Hit Checkmarx Supply Chain Apple Fixes iOS Flaw That Let FBI Recover Deleted Signal Messages Vercel Finds More Compromised Accounts in Context.ai-Linked Breach ThreatsDay Bulletin: $290M DeFi Hack, macOS LotL Abuse, ProxySmart SIM Farms +25 New Stories Bitwarden CLI Compromised in Ongoing Checkmarx Supply Chain Campaign LMDeploy CVE-2026-33626 Flaw Exploited Within 13 Hours of Disclosure FIRESTARTER Backdoor Hit Federal Cisco Firepower Device, Survives Security Patches Researchers Uncover Pre-Stuxnet ‘fast16’ Malware Targeting Engineering Software ⚡ Weekly Recap: Fast16 Malware, XChat Launch, Federal Backdoor, AI Employee Tracking and More Checkmarx Confirms GitHub Repository Data Posted on Dark Web After March 23 Attack Microsoft Confirms Active Exploitation of Windows Shell CVE-2026-32202 Chinese Silk Typhoon Hacker Extradited to U.S. Over COVID Research Cyberattacks Microsoft Patches Entra ID Role Flaw That Enabled Service Principal Takeover Researchers Discover Critical GitHub CVE-2026-3854 RCE Flaw Exploitable via Single Git Push Critical cPanel Authentication Vulnerability Identified — Update Your Server Immediately Popular Resources Discover Key AI Security Gaps CISOs Face in 2026 Fix Rising Application Security Risks Driven by AI Development Automate Alert Triage and Investigations Across Every Threat How to Identify Risky Browser Extensions in Your Organization

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