Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-90977— Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison

Quick assessment

Affected
Unknown Clean Login
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.

Clean Login WordPress 插件在 1.19 版本之前存在一个漏洞：当存储的会话值为空时，该插件未对注册验证码（CAPTCHA）进行有效验证，这使得未认证用户能够绕过注册表单上的防自动化控制，无需完成验证码即可创建账户。

CVSS 5.3 · Medium EPSS 0.37% · P32

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Clean Login < 1.19 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-90977

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Clean Login < 1.19 - Unauthenticated CAPTCHA Bypass via Empty Session Comparison
Source: CVE Program / CVE List V5
Vulnerability Description
The Clean Login WordPress plugin before 1.19 does not verify its registration CAPTCHA when the stored session value is empty, allowing unauthenticated users to bypass the anti-automation control on the registration form and create accounts without solving it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 Clean Login 0 ~ 1.19 -

II. Public POCs for CVE-2026-90977

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-90977

请登录查看更多情报信息。

Other References for CVE-2026-90977 (1)

Same Patch Batch · Unknown · 2026-09-18 · 32 CVEs total

CVE-2026-88994 6.6 MEDIUM All Bootstrap Blocks 1.3.20 - 1.3.31 - Contributor+ LFI via lightspeed Block Attributes
CVE-2026-79713 6.5 MEDIUM Breeze Cache 1.2.5 - 2.5.14 - Unauthenticated Cache Poisoning via Unkeyed Tracking Paramet
CVE-2026-90976 5.3 MEDIUM Clean Login < 1.19 - Unauthenticated Account Creation with Registration Disabled
CVE-2026-86800 5.3 MEDIUM WP Ghost (Hide My WP Ghost) < 7.0.11 - Unauthenticated URL Hiding Bypass via Loopback Comp
CVE-2026-86796 5.3 MEDIUM WP Ghost (Hide My WP Ghost) 7.0.10 - Unauthenticated Firewall, Threat Detection and URL Hi
CVE-2026-87775 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQLi via tzwrs_update_cell
CVE-2026-90978 Filter Gallery < 1.1.5 - Subscriber+ Arbitrary Post Overwrite and Plugin Option Deletion v
CVE-2026-90984 Generate PDF using Contact Form 7 < 4.2.2 - Unauthenticated Server-Side Request Forgery vi
CVE-2026-89008 Bookit < 2.6.0.5 - Bookit Staff+ Appointment PII Disclosure
CVE-2026-89007 Bookit < 2.6.0.5 - Bookit Staff+ Arbitrary Appointment Deletion via Missing Authorization
CVE-2026-87966 Easy Appointments 4.0 - 4.0.2.1 - Unauthenticated Arbitrary Appointment Modification and D
CVE-2026-88825 iGMS Direct Booking < 2.0 - Unauthenticated Stored XSS via Widget Settings
CVE-2026-88798 Really Simple Security (Free) < 9.8.3 - Unauthenticated Unbounded Option Growth via Spoofe
CVE-2026-88993 All Bootstrap Blocks <= 1.3.31 - Contributor+ Stored XSS via areoi/button type Attribute
CVE-2026-88844 MasterStudy LMS 3.6.2 - < 3.7.50 - Instructor+ Student PII Disclosure via IDOR
CVE-2026-87770 Price Drop Alert for WooCommerce <= 1.1 - Unauthenticated SQL Injection via product
CVE-2026-81810 All-in-One WP Migration and Backup < 7.111 - Authenticated Privilege Escalation to Admin v
CVE-2026-87771 Product Question and Answer <= 1.1.0 - Unauthenticated SQL Injection via p_id and read
CVE-2026-87774 Tz Weekly Radio Schedule <= 1.8.1 - Unauthenticated SQL Injection via week
CVE-2026-87965 Easy Appointments < 4.0.2.2 - Unauthenticated Appointment Cancellation/Confirmation via Fo

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Clean Login
Same vendor: Unknown