VulnSocial

CVE-2026-10100Disclosure

LOWCVSS 4.4 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

The Simple Custom Login Page plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the color settings fields (Page Background, Form Background, Text Color, Link Color) in versions up to and including 1.0.3. This is due to insufficient input sanitization of the color option values (they were registered with register_setting() and stored via the Settings API/update_option() with no sanitize_callback) combined with the values being output into a <style> block on wp-login.php using esc_attr(), which is incorrect for a CSS context (it does not escape ;, {, }, / or *). This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary CSS rules into the login page that are rendered for all unauthenticated visitors, enabling UI-redress and credential-phishing attacks.

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1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Threat summary

  • Public PoC is present in monitored signal
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-06-02); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-02: 1Mentions · 2026-06-08: 1PoC Mentioned / Linked · 2026-06-08: 1Technical Details · 2026-06-02: 1Technical Details · 2026-06-08: 106-0206-08
Signal classification2 categories
Disclosure
150.0%
PoC
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-06-021
Disclosure1
2026-06-081
PoC1
Full discourse2 posts
  • Atomic Edge@atomicedgeWAF
    PoC

    https://atomicedge.io/cve-proof/cve-2026-10100-simple-custom-login-page-version-1-0-3-medium-vulnerability-proof-of-concept CVE-2026-10100 simple-custom-login-page (CVSS Score 4.4) #WordPress plugin #vulnerability #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #…

    Post summary

    A proof‑of‑concept for CVE‑2026‑10100, targeting the Simple Custom Login Page WordPress plugin, is publicly linked and includes a CVSS score of 4.4. There is no indication of active exploitation, patches, or false‑positive status.

    0000044
    8 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-10100 Stored Cross-Site Scripting in Simple Custom Login Page Plugin for WordPress Up to 1.0.3 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-10100

    Post summary

    CVE-2026-10100 is a stored XSS vulnerability in the Simple Custom Login Page Plugin for WordPress versions up to 1.0.3, as reported on Vulmon.

    0000050
    4.0K followersView on X

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