CVE-2026-105475

Received Received - Intake

Improper NUL Byte Handling in cPanel Exposes Mail Data

Publication date: 2026-11-02

Last updated on: 2026-11-02

Assigner: HackerOne

Description

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

CVSS Scores

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Meta Information

Published

2026-11-02

Last Modified

2026-11-02

Generated

2026-11-03

AI Q&A

2026-11-03

EPSS Evaluated

N/A

NVD

CVE-2026-105475

Affected Vendors & Products

Vendor	Product	Version / Range
WebPros	cPanel	0
WebPros	cPanel	0
WebPros	cPanel	0
WebPros	cPanel	0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-158	The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.

Attack-Flow Graph

Executive Summary

CVE-2026-105475 is a vulnerability in cPanel that allows remote attackers to improperly neutralize a NUL byte, enabling them to read any mail account's calendar and contact data without authentication.

Impact Analysis

This vulnerability allows unauthenticated attackers to access sensitive calendar entries and contact details of any mail account hosted on the affected cPanel server, potentially leading to privacy breaches and data leaks.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to unauthorized access to personal and sensitive data, potentially resulting in legal penalties and reputational damage.

Mitigation Strategies

Update cPanel & WHM to the latest patched versions (134.0.67, 136.0.51, or 138.0.19 or later) to prevent unauthorized access to calendar and contact data.

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