CVE-2026-105475

Unauthenticated Data Leakage in cPanel Calendar and Contact Access

Published Nov 2, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Description

Improper neutralization of a NUL byte in cPanel allows remote attackers to read any mail account's calendar and contact data.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

WebPros

cPanel

unaffected

Version	Status	Constraints
`0`	affected	< 11.138.0.19
`0`	affected	< 11.136.0.51
`0`	affected	< 11.134.0.67
`0`	affected	< 11.110.0.154

No data.

Vendor Product Versions

Webpros

Cpanel

Version	Status	Scheme	Platform
`[0,11.138.0.19)`	affected	semver	—
`[0,11.136.0.51)`	affected	semver	—
`[0,11.134.0.67)`	affected	semver	—
`[0,11.110.0.154)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.455% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://support.cpanel.net/hc/en-us/articles/44356591132439-Security-CVE-2026-105475-Unauthenticated-Access-to-Calendar-and-Contact-Data-in-cPanel-WHM-October-20th-2026

History

Nov 2, 2026 11:00 PM Title updated. First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
Title		Unauthenticated Data Leakage in cPanel Calendar and Contact Access
First Time appeared		Webpros Webpros cpanel
Vendors & Products		Webpros Webpros cpanel

Nov 2, 2026 10:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Nov 2, 2026 9:15 PM Description updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Improper neutralization of a NUL byte in cPanel allows remote attackers to read any mail account's calendar and contact data.
Weaknesses		CWE-158
References		https://support.cpanel.net/hc/en-us/articles/44356591132439-Security-CVE-2026-105475-Unauthenticated-Access-to-Calendar-and-Contact-Data-in-cPanel-WHM-October-20th-2026
Metrics		cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`