CVE-2026-90977 Clean Login CVE debrief

Who should care

Defenders responsible for WordPress installations using the Clean Login plugin should assess exposure and prioritize verification and potential updates. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the presence of this vulnerability in their WordPress installations and assess exposure.

Why it matters

The Clean Login WordPress plugin vulnerability allows unauthenticated users to bypass CAPTCHA verification, potentially leading to account creation without proper validation.

• Defenders need to verify the presence of this vulnerability in their WordPress installations.
• Exposure could allow unauthenticated users to create accounts without solving the CAPTCHA.

Technical summary

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. This vulnerability affects WordPress installations using the Clean Login plugin, potentially allowing unauthorized account creation. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. Defenders should prioritize verifying the presence of this vulnerability in their WordPress installations and assess exposure.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their WordPress installations and assess exposure.

Recommended defensive actions

• Verify the presence of the Clean Login WordPress plugin version before 1.19 in your WordPress installations.
• Assess exposure by checking if the plugin is in use and if the CAPTCHA is not functioning as expected.
• Consider updating the plugin to version 1.19 or later if available.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with the primary source being the WPScan reference. The Clean Login WordPress plugin before 1.19 does not verify its registration CAPTCHA when the stored session value is empty. Defenders should verify the presence of this vulnerability in their WordPress installations and assess exposure. The CVE record was published on 2026-09-18T07:16:51.590Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.