7.5

CVE-2026-16736: unknown user registration & membership Improper Access Control

CVSS: 7.5v3.1HighDeferred
Published 05-08-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-16736 is a high (CVSS 7.5) Improper Access Control vulnerability in unknown user registration & membership. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.3% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 5.2.6.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 05-08-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

The User Registration & Membership WordPress plugin before 5.2.6 does not enforce the site's registration-disabled setting when processing registration-form submissions, allowing unauthenticated users to create new accounts even when the administrator has turned off open registration.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.11 pp

From 0.30% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (wpscan.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Unknown1 product
Wordpress1 product
  • user-registration≤ 5.2.5 (fixed in 5.2.6)

2 vendors · 2 products

References

2 links