What’s Vulnerable › Vulnerabilities

CVE-2018-17866

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-10-09 · updated 2026-06-17
• Weakness: CWE-79

Description

Multiple cross-site scripting (XSS) vulnerabilities in includes/core/um-actions-login.php in the "Ultimate Member - User Profile & Membership" plugin before 2.0.28 for WordPress allow remote attackers to inject arbitrary web script or HTML via the "Primary button Text" or "Second button text" field.

Affected products

• ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership P: before 2.0.28 — fixed in 2.0.28

How to fix

Upgrade to a fixed version: ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership P 2.0.28. Check the vendor advisory for mitigations.

References

• https://serhack.me/articles/ultimate-member-xss-security-issue
• https://wordpress.org/plugins/ultimate-member/#developers
• https://wpvulndb.com/vulnerabilities/9615
• https://serhack.me/articles/ultimate-member-xss-security-issue
• https://wordpress.org/plugins/ultimate-member/#developers
• https://wpvulndb.com/vulnerabilities/9615

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