CVE-2021-23435
7.6 · HIGHOverview
CVE-2021-23435 is a high-severity vulnerability affecting thoughtbot clearance. It was published on September 12, 2021 and has a CVSS 3.1 base score of 7.6 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).
Remediation
Check the references section for vendor advisories and patches from thoughtbot. Update clearance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| thoughtbot | clearance | >= 0, < 2.5.0 | Affected |
Frequently Asked Questions
What is CVE-2021-23435?
CVE-2021-23435 is a high-severity vulnerability affecting thoughtbot clearance. It was published on September 12, 2021 and has a CVSS 3.1 base score of 7.6 (HIGH).
How severe is CVE-2021-23435?
This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-23435?
Check the references section for vendor advisories and patches from thoughtbot. Update clearance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-23435?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-23435 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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