CVE-2026-54420
Exploitation confirmed. First attested on 2026-06-14 by CISA-ADP, CISA KEV, GCVE · kevintel.
- Published2026-06-14
- Fixed in2.4.8
- WeaknessCWE-61
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-54420?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-54420?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.4 | < 2.4.8 | 2.4.8 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.3 | < 5.3.2.0 | 5.3.2.0 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Litespeedtech litespeed cpanel plugin to 2.4.8
- CISA’s 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.due 2026-06-18
Advisories and patches
- blog.litespeedtech.comVendor Advisory
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 4 repositories, unverifiedHORKimhab/CVE-2026-54420Resellnom/litespeed-cpanel-cve-2026-54420-fixmahfuzreham/litespeed-cpanel-cve-2026-54420-fixfevar54/CVE-2026-54420-LiteSpeed-Symlink-Exploit PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-06-15
- Patch Due Date
- 2026-06-18
- Ransomware Use
- 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.
Sources
- NVDCVE recordread 2026-10-23
- CISA KEVKEV entry2026-06-15
- GCVEexploitation2026-06-14
- CISA-ADPSSVC decisionactive2026-06-15
- OpenCVESSVC decisionactive—
- CNACVSS 3.18.5read 2026-10-23
- CNAweakness (CWE)CWE-61read 2026-10-23
- FIRST EPSSEPSS score0.8 %2026-10-22
- PoC-in-GitHubproof of concept4read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Published
- 2026-06-14
- Last Modified
- 2026-07-23
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-54420?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.