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CVE-2023-30777

53
FAUCET Score

CVE-2023-30777 is an unauthenticated Reflected Cross-Site Scripting (XSS) vulnerability affecting WP Engine Advanced Custom Fields Pro and Advanced Custom Fields plugins up to version 6.1.5. With a CVSS score of 6.1 (Medium), this vulnerability is easily exploitable over the network with low attack complexity, requiring user interaction to achieve limited impact on confidentiality and integrity. Despite no KEV entry, exploit intelligence indicates active exploitation, with public Nuclei templates available and significant community discussion and media coverage highlighting its immediate impact on over one million WordPress sites.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.1.6CPE matchmatch criteria
cpe:2.3:a:advancedcustomfields:advanced_custom_fields:*:*:*:*:-:wordpress:*:*
< 6.1.6CPE matchmatch criteria
cpe:2.3:a:advancedcustomfields:advanced_custom_fields:*:*:*:*:pro:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
38.77%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Nuclei: CVE-2023-30777 · Jul 7, 2023
This CVE's current EPSS score of 0.3877 is in the 99th percentile among its peer group of 26,236 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

patchstack.com / articles/reflected-xss-in-advanced-custom-fields-plugins-affecting-2-million-sites
ExploitThird Party Advisory
patchstack.com / database/vulnerability/advanced-custom-fields-pro/wordpress-advanced-custom-fields-pro-plugin-6-1-5-reflected-cross-site-scripting-xss-vulnerability
Third Party Advisory
patchstack.com / database/vulnerability/advanced-custom-fields/wordpress-advanced-custom-fields-plugin-6-1-5-reflected-cross-site-scripting-xss-vulnerability
Third Party Advisory