XSS in Advanced Custom Fields (Acf®)

CVE-2026-110813

The Advanced Custom Fields (ACF®) WordPress plugin before 6.8.11 does not properly sanitize a stored field definition that can be modified through its comment handling, allowing unauthenticated users to inject a payload that is emitted as an HTML attribute name and executed as JavaScript in the browser of any visitor or administrator who views a page rendering the affected field.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (18.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

  • Advanced Custom Fields (Acf®)

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-110813?
CVE-2026-110813 is a high-severity vulnerability in Advanced Custom Fields (Acf®), classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-11-06.
How severe is CVE-2026-110813?
High severity. CVSS v3 base score is 7.5 out of 10.