Affects widely deployed cPanel/WHM hosting control panel; authenticated arbitrary root file write can lead to full host takeover and impact many hosting providers.
CVE-2026-105476
Authenticated users can write root-owned files via cPanel link-resolution bug.
Is CVE-2026-105476 being exploited?
Not confirmed. CVE-2026-105476 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-105476?
CVE-2026-105476 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-105476?
Yes. A fix has been recorded for CVE-2026-105476. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-105476 affect?
CVE-2026-105476 affects cPanel & WHM (hosting control panel). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-105476?
Install vendor patch immediately; restrict access and audit for suspicious activity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote authenticated users can write arbitrary root-owned files, enabling privilege escalation to root and full host compromise.
Immediate action required
- affected< 11.138.0.19
- affected< 11.136.0.51
- affected< 11.134.0.67
- affected< 11.110.0.154
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 2 Nov 2026 (SSVC 2.0.3).
timeline
- 2 Nov 2026CISA SSVC assessment: exploitation none
- 2 Nov 2026Published · 1 day later
- 3 Nov 2026CVE record last updated · same day later
- 3 Nov 2026Analysed by vulneraibility.com · same day later
- Linksupport.cpanel.net /hc/en-us/articles/44356595655703-Security-CVE-2026-105476-Arbitrary-File-Write-
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.