CVEs / CVE-2026-54420
CVE-2026-54420: LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
- Known exploited in the CISA KEV catalog since 15 Jun 2026
- high 8.5 CVSS 3.1 (from the CNA)
- EPSS 1.43% chance of exploitation in the next 30 days, higher than 73% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
LiteSpeed cPanel plugin contains a UNIX symbolic link (Symlink) following vulnerability that could allow a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| LiteSpeed Technologies cPanel Plugin | from 2.3, before 2.4.8 | 2.4.8 |
Exploitation
| In CISA KEV since | 15 Jun 2026 |
|---|---|
| Due date for US federal agencies | 18 Jun 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | 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. |
Severity
| CVSS 3.1 | 8.5 highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-61 |
References
- CVE-2026-54420 on NVD
- CVE-2026-54420 in the CISA KEV catalog
- https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/ (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- 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
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.