CVE-2021-41263
8.3 · HIGHOverview
CVE-2021-41263 is a high-severity vulnerability affecting discourse rails_multisite. It was published on November 15, 2021 and has a CVSS 3.1 base score of 8.3 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.3, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
rails_multisite provides multi-db support for Rails applications. In affected versions this vulnerability impacts any Rails applications using `rails_multisite` alongside Rails' signed/encrypted cookies. Depending on how the application makes use of these cookies, it may be possible for an attacker to re-use cookies on different 'sites' within a multi-site Rails application. The issue has been patched in v4 of the `rails_multisite` gem. Note that this upgrade will invalidate all previous signed/encrypted cookies. The impact of this invalidation will vary based on the application architecture.
Remediation
Check the references section for vendor advisories and patches from discourse. Update rails_multisite 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 |
|---|---|---|---|
| discourse | rails_multisite | >= 0, < 4.0.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-41263?
CVE-2021-41263 is a high-severity vulnerability affecting discourse rails_multisite. It was published on November 15, 2021 and has a CVSS 3.1 base score of 8.3 (HIGH).
How severe is CVE-2021-41263?
This vulnerability has a CVSS 3.1 base score of 8.3, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-41263?
Check the references section for vendor advisories and patches from discourse. Update rails_multisite 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-2021-41263?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-41263 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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