What’s Vulnerable › Vulnerabilities

CVE-2021-27237

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-16 · updated 2026-06-17
• Weakness: CWE-79

Description

The admin panel in BlackCat CMS 1.3.6 allows stored XSS (by an admin) via the Display Name field to backend/preferences/ajax_save.php.

Affected products

• blackcat-cms Blackcat CMS: 1.3.6

References

• https://github.com/BlackCatDevelopment/BlackCatCMS/commits/release-1.4/upload/backend/preferences/ajax_save.php
• https://github.com/BlackCatDevelopment/BlackCatCMS/compare/1.3.6...1.4Beta
• https://www.exploit-db.com/exploits/49565
• https://github.com/BlackCatDevelopment/BlackCatCMS/commits/release-1.4/upload/backend/preferences/ajax_save.php
• https://github.com/BlackCatDevelopment/BlackCatCMS/compare/1.3.6...1.4Beta
• https://www.exploit-db.com/exploits/49565

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