cPanel before 66.0.2 allows stored XSS during WHM cPAddons processing (SEC-269).

published 2019-08-02 7y ago modified 2026-06-17 4mo ago also EUVD-2017-9536

cvss: 5.4; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits: 0; none known

Patch / fix

fixed in 1

cpanel cpanel 66.0.2

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Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.4	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

documentation.cpanel.net /display/CL/66+Change+Log
release-notes, vendor-advisory

Sources

CVE List CVE-2017-18420
NVD CVE-2017-18420

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