WordPress plugin
Clean Login <= 1.18 — Unauthenticated CAPTCHA Bypass
CVE-2026-90977Published · Updated Action summary
Affected: ≤1.18Update to 1.19 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-804 Guessable CAPTCHA
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.4% chance in 30 days31th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
Clean Login clean-login
- Affected≤ 1.18
- Patched in1.19
Update to 1.19 or newer.
You are affected if you run ≤ 1.18. Version 1.19 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Clean Login.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.19, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Clean Login to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Arthur Morgan.
The Clean Login plugin for WordPress is vulnerable to CAPTCHA Bypass in all versions up to, and including, 1.18. This makes it possible for unauthenticated attackers to bypass captcha during registration.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Clean Login
All 9| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Missing Authorization to Authenticated (Contributor+) Arbitrary Clean-Login Option Update via 'save_post' Hook ≤1.20.1Update to 1.21 | CVE-2026-116610 | |
| Medium5.3 | Unauthenticated Account Registration ≤1.18Update to 1.19 | CVE-2026-90976 | |
| Medium5.3 | Unauthenticated Insecure Direct Object Reference ≤1.15Update to 1.16 | CVE-2026-54184 | |
| High8.8 | Authenticated (Contributor+) Local File Inclusion ≤1.14.5Update to 1.14.6 | CVE-2024-8252 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode ≤1.13.6Update to 1.13.7 | CVE-2022-4838 |
- Medium4.3Missing Authorization to Authenticated (Contributor+) Arbitrary Clean-Login Option Update via 'save_post' Hook
≤1.20.1Update to 1.21
- Medium5.3Unauthenticated Account Registration
≤1.18Update to 1.19
- Medium5.3Unauthenticated Insecure Direct Object Reference
≤1.15Update to 1.16
- High8.8Authenticated (Contributor+) Local File Inclusion
≤1.14.5Update to 1.14.6
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
≤1.13.6Update to 1.13.7
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.