MSRXCVE-2026-54420
CVE-2026-54420
LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVSS 3.1 · CNA · mitre.org
chance of exploitation in the next 30 days (EPSS; higher than 73% of CVEs)
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.
Scores
Affected products
- litespeedtech litespeed cpanel plugin: < 2.4.8
- litespeedtech litespeed whm plugin: < 5.3.2.0
Weakness: CWE-61
3 references (advisories, patches, write-ups)
- https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/ · Vendor Advisory
- https://www.litespeedtech.com/products/litespeed-web-server/control-panel-support/cpanel · Product
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-54420 · US Government Resource
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.