What’s Vulnerable › Vulnerabilities

CVE-2021-40555

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-16 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross site scripting (XSS) vulnerability in flatCore-CMS 2.2.15 allows attackers to execute arbitrary code via description field on the new page creation form.

Affected products

• Flatcore: 2.0.7

References

• https://github.com/flatCore/flatCore-CMS/issues/56
• https://github.com/flatCore/flatCore-CMS/issues/56

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