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CVE-2018-20986

19
FAUCET Score

CVE-2018-20986 describes a cross-site scripting (XSS) vulnerability in the Advanced Custom Fields plugin for WordPress, affecting versions prior to 5.7.8. This medium-severity flaw (CVSS 5.4) allows authenticated authors to inject malicious scripts, potentially leading to information disclosure or unauthorized actions. While no active exploitation, public exploit code, or significant community discussion has been observed, the vulnerability remains a risk for unpatched installations.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.7.8CPE matchmatch criteria
cpe:2.3:a:advancedcustomfields:advanced_custom_fields:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.0

5.4MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.95%
Probability of exploitation in next 30 days
EPSS Percentile
57.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0095 is in the 91st percentile among its peer group of 15,239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

wordpress.org / plugins/advanced-custom-fields
Release Notes
www2.deloitte.com / de/de/pages/risk/articles/wordpress-plugin-xss.html
advancedcustomfields.com / blog/acf-5-7-8-release
advancedcustomfields.com / changelog