CVE-2018-20150

In WordPress before 4.9.9 and 5.x before 5.0.1, crafted URLs could trigger XSS for certain use cases involving plugins.

Published: 2018-12-14 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-20150 is rated Moderate Risk (54/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.05%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-20150

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 7.37% 5.05% -2.32%
2 2026-03-04 9.07% 7.37% -1.71%
3 2026-03-01 — 9.07% —

Full EPSS history (43 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-20150

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2018-20150

OS Trackers for CVE-2018-20150

vendor priority summary link
debian not yet assigned CVE-2018-20150 not yet assigned priority: Debian including 1 source packages (wordpress), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-20150
ubuntu medium CVE-2018-20150 medium priority: Ubuntu including 1 source packages (wordpress), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 14, needed 2, DNE 1, ignored 1, released 1. https://ubuntu.com/security/CVE-2018-20150

Affected software / configurations for CVE-2018-20150

Vendor Product Version Raw CPE
wordpress wordpress < 4.9.9 cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*
wordpress wordpress >= 5.0, < 5.0.1 cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2018-20150

URL Tags
http://www.securityfocus.com/bid/106220 Third Party Advisory VDB Entry
https://codex.wordpress.org/Version_4.9.9 Product Vendor Advisory
https://github.com/WordPress/WordPress/commit/fb3c6ea0618fcb9a51d4f2c1940e9efcd4a2d460 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/02/msg00019.html Mailing List Third Party Advisory
https://wordpress.org/news/2018/12/wordpress-5-0-1-security-release/ Release Notes Vendor Advisory
https://wordpress.org/support/wordpress-version/version-5-0-1/ Release Notes Vendor Advisory
https://wpvulndb.com/vulnerabilities/9173 Vendor Advisory
https://www.debian.org/security/2019/dsa-4401 Third Party Advisory
https://www.zdnet.com/article/wordpress-plugs-bug-that-led-to-google-indexing-some-user-passwords/ Press/Media Coverage Third Party Advisory
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