CVE-2018-20863

CRITICAL

cPanel before 76.0.8 allows remote attackers to execute arbitrary code via mailing-list attachments (SEC-452).

Affects 1 product across 1 vendor.

CVSS 3.09.8
EPSS2.3%
Percentile83th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-20: Improper Input Validation

Software does not validate or incorrectly validates input, allowing attackers to craft data processed in unintended ways.

Related Attack Patterns (CAPEC)
CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
via CWE-20
CAPEC-7 Blind SQL Injection
via CWE-20
CAPEC-8 Buffer Overflow in an API Call
via CWE-20
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-20
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-20
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Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2019. A critical vulnerability affects Cpanel systems (CVE-2018-20863). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2019-GLOBAL-128534-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2018-20863?
This vulnerability was disclosed in 2019. A critical vulnerability affects Cpanel systems (CVE-2018-20863). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2018-20863?
CVE-2018-20863 has CVSS 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.3%.
Is CVE-2018-20863 actively exploited?
No confirmed active exploitation of CVE-2018-20863 as of 2026-09-25.
How do I remediate CVE-2018-20863?
Priority: MEDIUM. PSIRT: [email protected]
What systems are affected by CVE-2018-20863?
CVE-2018-20863 affects Cpanel Cpanel.
Vulnerability Details
CVE IDCVE-2018-20863
BSIDBS-2019-GLOBAL-128534-C BreachSpider Global ID
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2019-07-30
Last Modified2026-06-17
ICS Relevance0%
Weakness (CWE)
Improper Input Validation
SourceNVD
Official Description

cPanel before 76.0.8 allows remote attackers to execute arbitrary code via mailing-list attachments (SEC-452).

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: cPanel before 76.0.8 allows remote attackers to execute arbitrary code via mailing-list attachments (SEC-452). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Cpanel Cpanel < 76.0.8
Remediation

No official vendor advisory link on record. See the CVE record →

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2634 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hashaa82b07ee0e3d6ff752e6a202e767405923d8386b09e3137a60f96ed27b0de942886b22ad030cbe3946052c2e3e8461eb6d32048069bfd4a54ff236289e5b9d8
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