CASCACascade Atlas

Evidence dossier

CVE-2026-54420

CVE-2026-54420

63.5–78.5Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Jun 14, 2026
Updated
Jun 16, 2026
Evidence coverage
85%
CISA KEVCatalog member

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.

FIRST EPSS1.26%

2026-07-18 · v2026.06.15 · percentile 66.3%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

mitreoriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.012610000000; percentile 0.663470000000

Applicability

Cited product scope

Trace impact →
LiteSpeed TechnologiescPanel Plugin
[{"status": "affected", "version": "2.3", "lessThan": "2.4.8", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:litespeedtech:litespeed_cpanel_plugin:*:*:*:*:*:*:*:*; end excluding 2.4.8supported
Unknown vendorUnknown product
cpe:2.3:a:litespeedtech:litespeed_whm_plugin:*:*:*:*:*:*:*:*; end excluding 5.3.2.0supported

Assessments

CVSS by origin

8.5
cve@mitre.orgCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
8.5
mitreCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.