CVE-2018-17866 — 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

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MEDIUM

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

Published Oct 9, 2018

6.1

MEDIUM

CVSS 3.0

EPSS 1.65%

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

Remediation

No remediation recorded yet.

Metrics

1.65% 0.01648

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01648

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.65% (0.01648)	75.62th	v5 (v2026.06.15)
Jun 15, 2026	1.65% (0.01648)	73.34th	v5 (v2026.06.15)
Mar 30, 2025	0.36% (0.00359)	55.21th	v4 (v2025.03.14)
Mar 29, 2025	5.55% (0.05546)	83.38th	v4 (v2025.03.14)
Jul 20, 2024	0.14% (0.00136)	49.43th	v3 (v2023.03.01)
Oct 3, 2023	0.14% (0.00136)	48.41th	v3 (v2023.03.01)
Mar 7, 2023	0.13% (0.00130)	46.06th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)
Feb 3, 2022	1.11% (0.01110)	29.52th	v5 (v2026.06.15)
Apr 14, 2021	1.11% (0.01110)	0.00th	v1

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (3)

https://serhack.me/articles/ultimate-member-xss-security-issue
x_refsource_MISCExploitThird Party Advisory
https://wordpress.org/plugins/ultimate-member/#developers
x_refsource_CONFIRMProductRelease NotesThird Party Advisory
https://wpvulndb.com/vulnerabilities/9615
x_refsource_MISC

Link	Providers	Tags
https://serhack.me/articles/ultimate-member-xss-security-issue		x_refsource_MISCExploitThird Party Advisory
https://wordpress.org/plugins/ultimate-member/#developers		x_refsource_CONFIRMProductRelease NotesThird Party Advisory
https://wpvulndb.com/vulnerabilities/9615		x_refsource_MISC

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Oct 9, 2018

Updated Aug 5, 2024

Reserved Oct 1, 2018

Link CVE-2018-17866

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-17866

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-17866