Privilege escalation in Add User Autocomplete

CVE-2026-87759

The Add User Autocomplete WordPress plugin before 1.2 does not perform any capability or nonce check before creating a pending site-membership invitation carrying a caller-supplied role, allowing any authenticated user, such as a subscriber, to grant themselves the administrator role on a multisite installation.

Vulnerability class: Privilege Escalation

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% 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-2026-87759: held from 0.004 to 0.004.

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

Affected products

  • Add User Autocomplete

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-87759?
CVE-2026-87759 is a high-severity vulnerability in Add User Autocomplete, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-09-12.
How severe is CVE-2026-87759?
High severity. CVSS v3 base score is 8.8 out of 10.