# CVE-2026-87899 — WebPros cPanel

> As of 2026-09-24, CVE-2026-87899 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in WebPros cPanel, CVSS v4.0 9.4, EPSS 0.5% (45.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-87899, most recently “cPanel/WHM CalDAV/CardDAV and WP Toolkit Flaws Enable Cross-Account Access and Root Privilege Escalation (CVE-2026-68490, CVE-2026-87899, CVE-2026-87900)”.

**Last updated:** 2026-09-24

## What is CVE-2026-87899?

Execution with unnecessary privileges in cPanel allows remote authenticated users to execute arbitrary code with root privileges.

The record classifies CVE-2026-87899 under weakness class [CWE-250](https://intel.threadlinqs.com/cwe/CWE-250). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 17 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.4 — Critical (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 45.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-23, last modified 2026-09-24

## Is CVE-2026-87899 being exploited?

It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [WebPros](https://intel.threadlinqs.com/vendors/webpros): cPanel

## How to fix CVE-2026-87899

No vendor patch reference has been recorded for CVE-2026-87899 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-87899

1 tracked threat in the Threadlinqs corpus references CVE-2026-87899, either in the campaign’s CVE list or as an indicator on the campaign record.

- [cPanel/WHM CalDAV/CardDAV and WP Toolkit Flaws Enable Cross-Account Access and Root Privilege Escalation (CVE-2026-68490, CVE-2026-87899, CVE-2026-87900)](https://intel.threadlinqs.com/threat/TL-2026-2636) — CRITICAL · 2026-09-23

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [support.cpanel.net](https://support.cpanel.net/hc/en-us/articles/43591715125271)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-87899
Full detection coverage and IOCs for threats exploiting CVE-2026-87899 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp