CVE-2021-40555

5.4 mediumEPSS 0.4%

Medium (5.4) in flatcore flatcore. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2023-02-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

flatcore:flatcore

References

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

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