CVE-2018-20863

CRITICALNVD 9.89.8—

9.8

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

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 86.9%
KEV: Not listed

Published

July 30, 2019

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 26, 2026

No patch confirmed yet.

generic

cPanel & WHM Developer Portal

https://documentation.cpanel.net/display/CL/76+Change+Log

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:14 UTCEPSS rescore
2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-20863?

CVE-2018-20863 is a critical vulnerability published on July 30, 2019. cPanel before 76.0.8 allows remote attackers to execute arbitrary code via mailing-list attachments (SEC-452).

When was CVE-2018-20863 disclosed?

CVE-2018-20863 was first published in the National Vulnerability Database on July 30, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20863 actively exploited?

CVE-2018-20863 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-20863?

CVE-2018-20863 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2018-20863?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20863, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-20863

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

cPanel & WHM Developer Portal

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20863?

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Published

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Advisory Details (1)

Frequently asked(5)

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