CVE-2026-10100Network attack vector

Credential phishing via unsanitized login-page color settings

Published Jun 2, 2026 · Updated Jun 2, 2026

Stored cross-site scripting in Simple Custom Login Page 1.0.3 and earlier allows remote authenticated users to alter the login page. The plugin stores administrator-controlled color options without a sanitize_callback and inserts them into the wp-login.php style block with esc_attr(), which does not neutralize CSS delimiters. Administrator access is required; injected CSS is rendered for unauthenticated visitors and enables UI redress and credential phishing.

CVSS severity4.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Simple Custom Login Page 1.0.3 and earlier allows remote authenticated users to alter the login page. The plugin stores administrator-controlled color options without a sanitize_callback and inserts them into the wp-login.php style block with esc_attr(), which does not neutralize CSS delimiters. Administrator access is required; injected CSS is rendered for unauthenticated visitors and enables UI redress and credential phishing.

The record

CVE
CVE-2026-10100
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
George Pattichis
Product
Simple Custom Login Page
Classifications
CWE-79, CAPEC-63, T1056.002
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

George Pattichis · Simple Custom Login Pageversion=0 <=1.0.3

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)
T1056.002Input Capture: GUI Input Capture

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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