CVE-2021-39195
7.7 · HIGHOverview
CVE-2021-39195 is a high-severity vulnerability affecting misskey misskey. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in "Upload from URL" and remote attachment handling. This could result in the disclosure of non-public information within the internal network. This has been fixed in 12.90.0. However, if you are using a proxy, you will need to take additional measures. As a workaround this exploit may be avoided by appropriately restricting access to private networks from the host where the application is running.
Remediation
Check the references section for vendor advisories and patches from misskey. Update misskey 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 |
|---|---|---|---|
| misskey | misskey | >= 0, < 12.90.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-39195?
CVE-2021-39195 is a high-severity vulnerability affecting misskey misskey. It was published on September 7, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).
How severe is CVE-2021-39195?
This vulnerability has a CVSS 3.1 base score of 7.7, 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-2021-39195?
Check the references section for vendor advisories and patches from misskey. Update misskey 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-2021-39195?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-39195 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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