RCE in Modstart Mostartcms

CVE-2025-55824

ModStartCMS v9.5.0 has an arbitrary file write vulnerability, which allows attackers to write malicious files and execute malicious commands to obtain sensitive data on the server.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (15.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-55824: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-55824?
CVE-2025-55824 is a medium-severity vulnerability in Modstart Mostartcms, classified under Command Injection. CVSS score: 6.5/10. Published 2025-09-02.
How severe is CVE-2025-55824?
Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2025-55824 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.