CVE-2024-4023

Name: CVE-2024-4023
Creator: NVD / NIST
Published: 2025-03-20T10:15:32.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2024-4023 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.0

8.1/10

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

EPSS Probability

0.75%

50.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Flatpress	Flatpress	1.3

References

https://github.com/flatpressblog/flatpress/commit/3c9cc69364a45fd3f92d4bd606344b5dd1205d6aPatch
https://huntr.com/bounties/ed803c13-0858-4c22-93ba-bf2384ab1e9dExploit, Third Party Advisory

Timeline

Published: Mar 20, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-4023?

How severe is CVE-2024-4023?

CVE-2024-4023 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2024-4023?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-4023?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST