5.3

CVE-2026-86407: unknown user registration & membership

CVSS: 5.3v3.1MediumDeferred
Published 13-09-2026Last modified 13-09-2026
Open JSON

Vulnerability summary

CVE-2026-86407 is a medium (CVSS 5.3) vulnerability in unknown user registration & membership. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.1% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 5.2.8.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (wordfence)
EPSS score
0.28%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 13-09-2026
    PublishedVulnerability first disclosed.
  2. 13-09-2026
    Last modifiedVulnerability information updated.

Description

The User Registration & Membership WordPress plugin before 5.2.8 does not verify that the visitor requesting its membership confirmation page owns the account named in the request, nor that any registration or purchase has taken place, allowing unauthenticated users to retrieve another user's email address, profile fields, role and membership order details. Exploitation requires the site owner to have added a user smart tag to that page's configurable message, which the shipped default does not contain.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

+0.10 pp

From 0.18% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.28%

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≥ 5.0, ≤ 5.2.7 (fixed in 5.2.8)

2 vendors · 2 products

References

2 links