CVE-2021-24563

MEDIUM

Frontend Uploader < 1.3.2 - Unauthenticated Stored Cross-Site Scripting via HTML File Upload

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2021-24563. PoCs published by Veshraj Ghimire, V35HR4J.

AI-analyzed exploit summary This exploit demonstrates a stored XSS vulnerability in WordPress Plugin Frontend Uploader 1.3.2, allowing unauthenticated users to upload malicious HTML files containing JavaScript, which executes when accessed.

Description

The Frontend Uploader WordPress plugin through 1.3.2 does not prevent HTML files from being uploaded via its form, allowing unauthenticated user to upload a malicious HTML file containing JavaScript for example, which will be triggered when someone access the file directly

Exploits (2)

exploitdb WORKING POC
by Veshraj Ghimire · textwebappsphp
https://www.exploit-db.com/exploits/50655

This exploit demonstrates a stored XSS vulnerability in WordPress Plugin Frontend Uploader 1.3.2, allowing unauthenticated users to upload malicious HTML files containing JavaScript, which executes when accessed.

Classification
Working Poc 100%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: WordPress Plugin Frontend Uploader 1.3.2
No auth needed
Prerequisites: Access to the WordPress site with the vulnerable plugin installed
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 1 stars
by V35HR4J · poc
https://github.com/V35HR4J/CVE-2021-24563

The repository provides a functional proof-of-concept for CVE-2021-24563, demonstrating an unauthenticated stored XSS vulnerability in Frontend Uploader <= 1.3.2 via HTML file upload. The PoC includes a detailed HTTP request to exploit the vulnerability and trigger the XSS payload.

Classification
Working Poc 95%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Frontend Uploader <= 1.3.2
No auth needed
Prerequisites: Access to a WordPress site with the vulnerable plugin installed · A page/post with the [fu-upload-form] shortcode embedded
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://wpscan.com/vulnerability/e53ef41e-a176-4d00-916a-3a03835370f1

Scores

CVSS v3 6.1
EPSS 0.2638
EPSS Percentile 97.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
frontend_uploader_project/frontend_uploader < 1.3.2
Published Oct 11, 2021
Tracked Since Feb 18, 2026