What is CVE-2024-4023?

CVE-2024-4023 is a high-severity vulnerability in Flatpress, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2025-03-20.

How severe is CVE-2024-4023?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Flatpress

CVE-2024-4023

A stored cross-site scripting (XSS) vulnerability exists in flatpressblog/flatpress version 1.3. When a user uploads a file with a `.xsig` extension and directly accesses this file, the server responds with a Content-type of application/octet-stream, leading to the file being processed as an HTML file. This allows an attacker to execute arbitrary JavaScript code, which can be used to steal user cookies, perform HTTP requests, and access content of the same origin.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.007 (51.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

Affected products

Flatpress — versions 1.3
Flatpressblog Flatpressblog/flatpress — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@huntr.dev (Exploit, Third Party Advisory)
security@huntr.dev (Patch)

Frequently asked questions

What is CVE-2024-4023?: CVE-2024-4023 is a high-severity vulnerability in Flatpress, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2025-03-20.
How severe is CVE-2024-4023?: High severity. CVSS v3 base score is 8.1 out of 10.