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.
Timeline
- 2026-06-14Published to the U.S. National Vulnerability Database (NVD)
- 2026-06-15Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-06-17NVD record last updated
- 2026-06-18CISA federal remediation deadline (BOD 22-01)
CISA Known Exploited Vulnerability
LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
Affected product
LiteSpeed CPanel Plugin
NVD also lists CPE entries for: Litespeedtech Litespeed Cpanel Plugin, Litespeedtech Litespeed Whm Plugin
Remediation Steps
- Apply the patch for the LiteSpeed cPanel user-end plugin to all cPanel servers
- Test patched plugin functionality in a staging environment before production deployment
- Review server logs for evidence of exploitation attempts
- Notify hosting customers of patch deployment timeline
References
- https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-54420
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 2 of July 2026 (July 13 – 19)
- Vulnerability Priority Report – Week 1 of July 2026 (July 6 – 12)
- Vulnerability Priority Report – Week 5 of June 2026 (June 29 – July 5)
- Vulnerability Priority Report – Week 4 of June 2026 (June 22 – 28)
- Vulnerability Priority Report – Week 3 of June 2026 (June 15 – 21)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.