CVE-2024-31835

MediumPublic PoC

Published: 01 October 2024

Published

01 October 2024

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 4.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Score 0.2315 96.1th percentile

Risk Priority 23 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-31835 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Flatpress Flatpress. Its CVSS base score is 4.8 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 3.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

CVE-2024-31835 is a cross-site scripting vulnerability, tracked as CWE-79, that affects Flatpress CMS version 1.3. The flaw resides in the file name parameter and permits a remote attacker to supply a crafted payload that results in arbitrary code execution. It carries a CVSS 3.1 base score of 4.8, reflecting network attack vector, low attack complexity, high privileges required, and required user interaction, with limited impacts on confidentiality and integrity and no availability impact.

An authenticated attacker with administrative access can exploit the issue by uploading or referencing a maliciously named file, causing the injected script to execute in the context of other users who view the affected page. The changed scope in the CVSS vector indicates the script can affect resources beyond the vulnerable Flatpress instance.

The EPSS score for this CVE stands at 0.2315 with no material increase from its recorded peak, indicating moderate but stable exploitation interest since disclosure. Public references include a proof-of-concept repository and supporting materials that demonstrate the file-name injection vector.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2024-29706

Vulnerability details

Cross Site Scripting vulnerability in flatpress CMS Flatpress v1.3 allows a remote attacker to execute arbitrary code via a crafted payload to the file name parameter.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

T1539 Steal Web Session Cookie Credential Access

An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.

attack.mitre.org →

T1555.003 Credentials from Web Browsers Credential Access

Adversaries may acquire credentials from web browsers by reading files specific to the target browser.

attack.mitre.org →

Why these techniques?

XSS vulnerability in Flatpress CMS file upload filename parameter enables exploitation of public-facing web application (T1190), JavaScript code execution in victim browser (T1059.007), and facilitates stealing web session cookies (T1539) and browser credentials (T1555.003).