What is the CVSS score of EUVD-2026-30178?

EUVD-2026-30178 has a CVSS 3.1 base score of 8.6 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L. EPSS exploitation probability: 0.0%.

Which versions of cPanel & WHM are affected by EUVD-2026-30178?

A high-severity vulnerability in cPanel & WHM (versions 11.120-11.136) permits unauthenticated remote attackers to download arbitrary files from affected servers, exposing customer data,…. A patch is available.

How to fix or mitigate EUVD-2026-30178?

Within 24 hours: Inventory all cPanel 11.120-11.136 and WP Squared 11.120.1.0-11.136.1.12 deployments; assess customer data classifications on affected instances. Within 7 days: Deploy vendor-released patch to all affected systems; validate patch installation across infrastructure. Within 30 days: Review access and download logs from affected cpdavd endpoints for indicators of exploitation; confirm patch compliance across all hosts.

cPanel & WHM EUVD-2026-30178

| CVE-2026-29205 HIGH

Execution with Unnecessary Privileges (CWE-250)

2026-05-13 support@hackerone.com

GHSA-cc7w-h7g4-gq6p

Privilege Escalation Cpanel Wp Squared Whm

8.6

CVSS 3.1 · Vendor: hackerone

Severity by source

Vendor (hackerone) PRIMARY

8.6 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Primary rating from Vendor (hackerone) · only source for this CVE.

CVSS VectorVendor: hackerone

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Jun 08, 2026 - 08:57 vuln.today

Patch available

May 13, 2026 - 23:17 EUVD

DescriptionCVE.org

Incorrect privileges management and insufficient path filtering allow to read arbitrary file on the server via the cpdavd attachment download endpoints.

AnalysisAI

Arbitrary file read in cPanel & WHM's cpdavd service allows remote unauthenticated attackers to retrieve sensitive files from the server through attachment download endpoints that fail to properly filter paths and enforce privilege boundaries. The flaw affects multiple supported cPanel release tiers (11.120 through 11.136) and WP Squared 11.120.1.0-11.136.1.12, scoring CVSS 8.6 due to network reach without authentication, though EPSS exploitation probability is only 0.04% and no public exploit identified at time of analysis.

Technical ContextAI

cpdavd is cPanel's WebDAV/CalDAV/CardDAV daemon that handles attachment downloads as part of the mail and calendaring stack on cPanel & WHM servers. The root cause is CWE-250 (Execution with Unnecessary Privileges) combined with insufficient path filtering: the attachment download endpoints operate with broader filesystem privileges than required and fail to canonicalize or constrain user-supplied paths, enabling traversal-style reads of arbitrary files accessible to the daemon's effective user. Because cpdavd typically runs with elevated rights to service multi-tenant mailboxes, the privilege scope materially widens the set of files an attacker can disclose.

RemediationAI

Vendor-released patch is available: upgrade cPanel & WHM to 11.124.0.38, 11.126.0.59, 11.130.0.23, 11.132.0.32, 11.134.0.26, or 11.136.0.10 depending on your release tier, and upgrade WP Squared to 11.136.1.12, per the cPanel advisory at https://support.cpanel.net/hc/en-us/articles/40437020299927-Security-CVE-2026-29205-cPanel-WHM-WP2-Security-Update-May-13-2026. Because cpdavd uses automatic updates by default on supported tiers, verify the running version with /usr/local/cpanel/cpanel -V after patching. As a temporary compensating control until patched, restrict network access to the cpdavd service ports (typically 2079/2080 for DAV) at the host or perimeter firewall to trusted management networks only - note this will break legitimate remote WebDAV/CalDAV/CardDAV clients for mail and calendar attachments, and stopping cpdavd entirely will disable DAV-based mail attachment download and calendar/contact sync for end users.