CVE-2026-18356— Limit Login Attempts Reloaded < 3.3.5 - Username Denylist Bypass via Case Variant and Account Email
Quick assessment
Affected
Unknown Limit Login Attempts Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress 插件 “Limit Login Attempts Reloaded” 在 3.3.5 版本之前存在一个安全漏洞：该插件在对登录用户名进行黑名单比对时，未采用大小写不敏感的方式，且未将用户的电子邮件地址纳入考虑范围。这导致管理员意图阻止登录的账户仍可能成功通过身份验证。
Possible ATT&CK Techniques 1 AI
T1078 · Valid AccountsAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Unknown | Limit Login Attempts Security | < 3.3.5 |
affected |
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I. Basic Information for CVE-2026-18356
Vulnerability Information
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Vulnerability Title
Limit Login Attempts Reloaded < 3.3.5 - Username Denylist Bypass via Case Variant and Account Email
Source: CVE Program / CVE List V5
Vulnerability Description
The Limit Login Attempts Reloaded WordPress plugin before 3.3.5 does not compare logins against its username denylist case-insensitively and does not account for the account's email address, allowing an account an administrator intended to block from logging in to authenticate anyway.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Unknown | Limit Login Attempts Security | 0 ~ 3.3.5 | - |
|
II. Public POCs for CVE-2026-18356
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-18356 (1)
-
🔗 Limit Login Attempts Reloaded < 3.3.5 – Username Denylist Bypass via Case Variant and Account Email | CVE 2026-18356 | Plugin Vulnerabilities Read full article exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-08-21 · 20 CVEs total
| CVE-2026-19848 | 6.5 MEDIUM | ProfilePress < 4.17.1 - Unauthenticated Arbitrary Shortcode Execution via Display Name |
| CVE-2026-17559 | 5.3 MEDIUM | Content Protector (Passster) < 4.3.9 - Unauthenticated Protected Content Disclosure via RE |
| CVE-2026-16650 | 5.3 MEDIUM | Charitable < 1.8.12 - Unauthenticated Donation Payment-Status Manipulation via Square Webh |
| CVE-2026-15150 | 5.3 MEDIUM | myCred < 3.2.5 - Unauthenticated Payment Bypass via Missing PayPal IPN Receiver Verificati |
| CVE-2026-15046 | 4.2 MEDIUM | LitExtension: Store to WooCommerce Migration <= 1.2.5 - Connector Token Takeover via CSRF |
| CVE-2026-13176 | 2.7 LOW | Eventin < 4.1.21 - Contributor+ Server-Side Request Forgery |
| CVE-2026-13736 | NewPath WildApricotPress Add-on – Member Directory <= 1.0.0 - Unauthenticated Member PII D | |
| CVE-2025-15671 | Welcart e-Commerce < 2.12.1 - Session Fixation via uscesid Parameter | |
| CVE-2026-14325 | Drag and Drop Multiple File Upload for Contact Form 7 < 1.3.9.9 - Admin+ Stored XSS via dr | |
| CVE-2026-14601 | Link Whisper < 0.9.7 - Editor+ SQL Injection via domain Parameter | |
| CVE-2026-16576 | Dokan < 5.0.14 - Shop Manager+ Arbitrary Plugin Installation/Activation via REST API | |
| CVE-2026-16962 | Tamara Checkout <= 1.9.9.20 - Unauthenticated Order Status Manipulation | |
| CVE-2026-16575 | Dokan < 5.0.14 - Unauthenticated Commission Settings Disclosure via Store Categories REST | |
| CVE-2026-19085 | Copy & Delete Posts < 1.5.6 - Author+ Password-Protected Post Content Disclosure | |
| CVE-2026-19435 | Copy & Delete Posts < 1.5.6 - Authenticated Arbitrary Post Content and Password Disclosure | |
| CVE-2026-18781 | Drag and Drop Multiple File Upload for Contact Form 7 < 1.3.9.9 - Unauthenticated RCE via | |
| CVE-2026-16959 | Media Library Assistant < 3.40 - Author+ SQL Injection via mla_search_connector | |
| CVE-2026-16577 | Dokan < 5.0.14 - Vendor+ Reverse Withdrawal Ledger Manipulation via Client-Supplied Amount | |
| CVE-2026-75796 | AI Engine 2.8.0 - 3.6.0 - Admin+ Multisite Network Administrator Account Takeover via MCP |
IV. Related Vulnerabilities
Same vendor: Unknown
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CVE-2026-77116
Brave Popup Builder < 0.8.6 - Subscriber+ Unpublished Popup -
CVE-2026-77003
Content Mask 1.8.0 - 1.8.5.4 - Contributor Publish Capabilit -
CVE-2026-14853
WooCommerce Bookings < 3.9.0 - Subscriber+ Draft Bookable Pr -
CVE-2026-13598
RestrictMate < 1.3.0 - Unauthenticated Privilege Escalation
V. Comments for CVE-2026-18356
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