Flatpress
CVE-2024-4023
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 8.1 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.20%. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAIv1 – Mar 28, 2026
A stored cross-site scripting (XSS) vulnerability exists in flatpressblog/flatpress version 1.3. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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. Affected products include: Flatpress. Version information: version 1.3..
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
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.
Executive ViewAI
Organizations using flatpressblog/flatpress face notable risk from CVE-2024-4023, a cross-site scripting vulnerability rated CVSS 8.1. Attackers could inject malicious scripts to steal user sessions, credentials, or perform actions on behalf of authenticated users. Proof-of-concept code is publicly available, increasing the risk of exploitation. A patch is available and should be applied as part of regular vulnerability management.
Apply vendor patch. If immediate patching is not feasible: (1) Implement Content-Security-Policy headers; (2) Enable HttpOnly and SameSite cookie attributes; (3) Deploy WAF XSS/CSRF rules.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)CVE.org
Path Traversal in GitHub repository flatpressblog/flatpress prior to 1.3. Rated critical severity (CVSS 9.8), this vulne
PHP Remote File Inclusion in GitHub repository flatpressblog/flatpress prior to 1.3. Rated critical severity (CVSS 9.8),
External Control of File Name or Path in GitHub repository flatpressblog/flatpress prior to 1.3. Rated high severity (CV
FlatPress CMS version latest is vulnerable to Cross-Site Request Forgery (CSRF) attacks that allow an attacker to enable
Flatpress v1.2.1 was discovered to contain a remote code execution (RCE) vulnerability in the Upload File function. Rate
flatpress 1.3.1 is vulnerable to Cross Site Scripting (XSS) in Administration area via Manage categories. Rated medium s
A cross-site scripting (XSS) vulnerability in Flatpress v1.3 allows attackers to execute arbitrary web scripts or HTML v
A cross-site scripting (XSS) vulnerability in Flatpress v1.3 allows attackers to execute arbitrary web scripts or HTML v
Cross-site Scripting (XSS) - Reflected in GitHub repository flatpressblog/flatpress prior to 1.3. Rated medium severity
A vulnerability was found in FlatPress. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable,
Flatpress v1.2.1 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the page parameter a
A cross-site scripting (XSS) vulnerability has been identified in Flatpress 1.3. Rated medium severity (CVSS 5.4), this
Exploit-DB