PT-2025-12160 · Flatpress · Flatpress

Published 2025-03-20 · Updated 2025-06-23 · CVE-2024-4023

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions flatpressblog/flatpress version 1.3

Description A stored cross-site scripting (XSS) issue exists. 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.

Recommendations For version 1.3, consider restricting the upload of files with a .xsig extension to prevent exploitation until a patch is available. As a temporary workaround, avoid directly accessing uploaded files with this extension to minimize the risk of arbitrary JavaScript code execution.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2024-4023

Affected Products

Flatpress

References · 6

• 🔥 https://huntr.com/bounties/ed803c13-0858-4c22-93ba-bf2384ab1e9d · Exploit
• https://github.com/flatpressblog/flatpress/commit/3c9cc69364a45fd3f92d4bd606344b5dd1205d6a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2024-4023 · Security Note
• https://osv.dev/vulnerability/CVE-2024-4023 · Vendor Advisory
• https://t.me/cvenotify/126424 · Telegram Post
• https://twitter.com/CVEnew/status/1902968859600245124 · Twitter Post