What is CVE-2025-56236?

CVE-2025-56236 is a medium-severity vulnerability in Formcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-08-28.

How severe is CVE-2025-56236?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2025-56236 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Formcms

CVE-2025-56236

FormCms v0.5.5 contains a stored cross-site scripting (XSS) vulnerability in the avatar upload feature. Authenticated users can upload .html files containing malicious JavaScript, which are accessible via a public URL. When a privileged user accesses the file, the script executes in their browser context.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (11.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Formcms
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@mitre.org (Exploit, Issue Tracking)
cve@mitre.org (Third Party Advisory)

Frequently asked questions

What is CVE-2025-56236?: CVE-2025-56236 is a medium-severity vulnerability in Formcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-08-28.
How severe is CVE-2025-56236?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2025-56236 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.