---
title: LiteSpeed cPanel Plugin Zero-Day Under Active Exploitation
description: Critical vulnerability in the LiteSpeed cPanel plugin threatens global shared hosting; update the user-end plugin to 2.4.8 and the WHM plugin to 5.3.2.1.
canonical_url: https://codekeeper.co/ticker/critical-zero-day-litespeed-vulnerability
---

# LiteSpeed cPanel Plugin Zero-Day Under Active Exploitation

Critical vulnerability in the LiteSpeed cPanel plugin threatens global shared hosting; update the user-end plugin to 2.4.8 and the WHM plugin to 5.3.2.1.

![Content Team](https://codekeeper.co/hubfs/_sized/Codekeeper_21_beeldmerkL-800.png)

By Content Team Jul 6, 2026

Share [![Share on facebook](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Facebook.svg)](http://www.facebook.com/share.php?u=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dfacebook) [![Share on linkedin](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Linkedin.svg)](http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dlinkedin) [![Share on twitter](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20X.svg)](https://twitter.com/intent/tweet?original_referer=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&url=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&source=tweetbutton&text=) [![Share on email](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Mail.svg)](mailto:?subject=Check%20out%20https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Demail%20&body=Check%20out%20https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Demail) ![Copy link](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Copy.svg)

ON THIS PAGE

### Want more insights like this?

Subscribe to our newsletter to get the latest software protection strategies delivered to your inbox.

By submitting your email, you consent to Codekeeper contacting you and agree to our [privacy policy](https://codekeeper.co/privacy-policy) .

A critical vulnerability in the LiteSpeed cPanel user-end plugin is being actively exploited, threatening shared hosting environments globally. Tracked as CVE-2026-54420, the flaw lets attackers with limited access — like stolen FTP credentials — bypass CloudLinux's CageFS isolation and escalate all the way to root, potentially exposing every site on a shared server. CISA has flagged it as actively exploited. Namecheap researchers discovered the issue after spotting suspicious API call patterns: rapid concurrent chaining of the generateEcCert and packageUserSize functions across multiple threads. LiteSpeed patched it on June 1, 2026 — in user-end plugin version 2.4.8 and WHM plugin version 5.3.2.1. Update both immediately, or remove the user-end plugin as a stopgap. And because exploitation started before the patch existed, review your logs for those API call patterns: updating now won't tell you whether you were already hit. **Source:** [Cybersecurity News](https://cybersecuritynews.com/litespeed-cpanel-plugin-0-day-vulnerability-exploit/)

Share this article [![Share on facebook](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Facebook.svg)](http://www.facebook.com/share.php?u=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dfacebook) [![Share on linkedin](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Linkedin.svg)](http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dlinkedin) [![Share on twitter](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20X.svg)](https://twitter.com/intent/tweet?original_referer=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&url=https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Dtwitter&source=tweetbutton&text=) [![Share on email](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Mail.svg)](mailto:?subject=Check%20out%20https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Demail%20&body=Check%20out%20https%3A%2F%2Fcodekeeper.co%2Fticker%2Fcritical-zero-day-litespeed-vulnerability%3Futm_medium%3Dsocial%26utm_source%3Demail) ![Copy link](https://codekeeper.co/hubfs/Codekeeper%202025/Icons/Blog%20-%20Copy.svg)

![blog_book_a_demo_cta_3x](https://codekeeper.co/hubfs/_sized/Codekeeper%202025/blog_book_a_demo_cta_3x-768x512.webp)

Have questions about protecting your software?

Our escrow experts are standing by to help.

[Book a free demo](https://codekeeper.co/book-a-demo)

YOU MAY ALSO LIKE

[Cyberattacks ‘AgentCorruption’ Could Have Hijacked an AWS Region With One Prompt Oct 9, 2026](https://codekeeper.co/ticker/aws-agentcorruption-vulnerability-patched)

[Russian FSB-Linked Worm Uses Native Windows Feature to Infiltrate Ukrainian Networks Aug 12, 2026](https://codekeeper.co/ticker/fsb-gammaworm-targets-ukraine)

[Cyberattacks CenterPoint Confirms Data Breach After Hacker Leaks Customer Records Sep 16, 2026](https://codekeeper.co/ticker/centerpoint-energy-data-breach-2023)

[Cyberattacks Trivy Compromise, Not LiteLLM, Drove Most of the March Supply Chain Exposure Aug 17, 2026](https://codekeeper.co/ticker/trivy-scanner-supply-chain-attack-impact)