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Fencer Vulns
medium 6.1

CVE-2021-24563 json

Frontend Uploader <= 1.3.2 - Unauthenticated Stored Cross-Site Scripting

published 2021-10-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11475

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
26.3%
EPSS 26.3% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

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

Timeline

  1. Published
  2. First public exploit (EDB-50655)

Exploit prediction

26.27% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50655 WordPress Plugin Frontend Uploader 1.3.2 - Stored Cross Site Scripting (XSS) (Unauthenticated) webapps, 2022-01-12
  • wpscan.com https://wpscan.com/vulnerability/e53ef41e-a176-4d00-916a-3a03835370f1 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/165515/WordPress-Frontend-Uploader-1.3.2-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Unknown Frontend Uploader

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.