Vulnerability in Ultimate Member

CVE-2026-11766

The Ultimate Member WordPress plugin before 2.12.0 does not properly sanitise and escape the value of custom textarea profile fields before outputting it on user profiles, allowing authenticated users with Subscriber-level access and above to store JavaScript that executes when any user, including an administrator, views the affected profile.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-11766: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Ultimate Member — versions 0

References

Frequently asked questions

What is CVE-2026-11766?
CVE-2026-11766 is a high-severity vulnerability in Ultimate Member, classified under CWE-79 CROSS-SITE SCRIPTING (XSS). CVSS score: 8.0/10. Published 2026-07-06.
How severe is CVE-2026-11766?
High severity. CVSS v3 base score is 8.0 out of 10.