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PatchSiren cyber security CVE debrief

CVE-2026-29201 cPanel CVE debrief

cPanel released a vendor security update for all supported cPanel & WHM versions that includes a fix for CVE-2026-29201, an arbitrary file read issue in the LOADFEATUREFILE adminbin call. The same update also addresses two additional vulnerabilities in cPanel & WHM, but this debrief focuses on the file-read issue tracked as CVE-2026-29201.

Vendor
cPanel
Product
cPanel/WHM
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-08
Original CVE updated
2026-05-12
Advisory published
Unknown
Advisory updated
Unknown

Who should care

Administrators and operators running supported cPanel & WHM installations should review and apply the relevant security update. Security teams responsible for hosting control panels should prioritize systems that expose administrative functionality or store sensitive local configuration data.

Technical summary

According to cPanel’s vendor advisory, CVE-2026-29201 is an arbitrary file read vulnerability in the LOADFEATUREFILE adminbin call within cPanel & WHM. The vendor states that the security update applies across the supported release branches 136, 134, 132, 130, 126, 124, 118, 110, 102, 94, and 86. No additional technical detail was provided in the supplied source beyond the file-read condition and the affected call path.

Defensive priority

High. Arbitrary file read issues in administrative components can expose configuration data, credentials, or other local secrets. Even without further exploitation details in the supplied source, this is a meaningful exposure for systems running cPanel & WHM and should be remediated promptly with the vendor update.

Recommended defensive actions

  • Apply the cPanel & WHM security update for the affected supported version branch as soon as possible.
  • Verify the installed cPanel & WHM version against the supported branches listed in the vendor advisory.
  • Review access to administrative interfaces and limit exposure where operationally feasible.
  • Check for any evidence of unauthorized access to sensitive files or unusual administrative activity around the update window.
  • Monitor the cPanel release notes and change logs for the exact patched build corresponding to your version.

Evidence notes

Evidence is limited to the vendor-official cPanel release-notes entry supplied in the corpus. The source explicitly states that the update patches three vulnerabilities and identifies CVE-2026-29201 as an arbitrary file read in the LOADFEATUREFILE adminbin call. No CVSS score, publication date, or additional exploit details were provided in the supplied data, so none are inferred here.

Official resources

Vendor-official cPanel security update; the supplied source groups CVE-2026-29201 with two related cPanel & WHM vulnerabilities and does not provide a publication date in the corpus.