CVE-2018-0587

Ultimate Member <= 2.0.3 - Unauthorized Image File Upload

2019-08-12 00:00

Strategic Overview

Status: Patched in 2.0.4
Affected Plugin: Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
Affected Version: <= 2.0.3
CVSS: 4.3Medium
Weakness type: CWE-285 · Improper Authorization
CVE: CVE-2018-0587

View all Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin vulnerabilities

At a glance

CVE-2018-0587 is a medium-severity Improper Authorization vulnerability in the Ultimate Member WordPress plugin, affecting versions <= 2.0.3. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). The issue is fixed in version 2.0.4; sites on affected versions should update now. Disclosed August 2019, reported by Gen Sato.

Vulnerability Overview

Unrestricted file upload vulnerability in Ultimate Member plugin prior to version 2.0.4 for WordPress allows remote authenticated users to upload arbitrary image files via unspecified vectors.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-285: Improper Authorization

Reaching this weakness in Ultimate Member <= 2.0.3 takes a caller who can reach the endpoint. Improper authorization means a permission check exists but does not cover the case being exercised, so a caller who is allowed to do one thing is allowed to do a neighbouring thing as well.

A lower-privileged account performs an action reserved for a higher one, which on a multi-author or membership site means an ordinary user reaching administrative behaviour. For Ultimate Member the fix is 2.0.4: builds <= 2.0.3 are affected, anything from 2.0.4 onward is not.

Remediation

Update to version 2.0.4, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Ultimate Member 2.0.4 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-0587 https://www.wordfence.com/threat-intel/vulnerabilities/id/5e75e877-14e6-4e51-b435-d78f8ab95d12 https://nvd.nist.gov/vuln/detail/CVE-2018-0587

Related records

Same weakness class

8.0CVE-2026-4248: Ultimate Member Info Exposure to Account TakeoverCVE-2026-4248

Other vulnerabilities in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin

CVSS Vector

4.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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