CVE-2026-54420: litespeed whm — Actively Exploited & Fix

Description

LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0) mishandles symlinks provided by a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, as exploited in the wild in May 2026.

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CVSS v3.1 Score

8.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0126

Probability of exploitation

0.66%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Jun 15, 2026 Remediation due: Jun 18, 2026

Weakness Type (CWE)

CWE-61 CWE-61

Affected Products

Vendor	Product	Versions
litespeedtech	litespeed_cpanel_plugin	< 2.4.8
litespeedtech	litespeed_whm_plugin	< 5.3.2.0

References

Advisories & Patches

https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/

Other References

https://www.litespeedtech.com/products/litespeed-web-server/control-panel-support/cpanel https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-54420

Frequently Asked Questions

What is CVE-2026-54420? +

LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0) mishandles symlinks provided by a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, as exploited in the wild in May 2026. It has a CVSS v3.1 base score of 8.5 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-54420? +

CVE-2026-54420 has a CVSS v3.1 score of 8.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0126, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-54420? +

CVE-2026-54420 affects products from litespeedtech, specifically: litespeed_cpanel_plugin, litespeed_whm_plugin. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-54420? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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