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Fencer Intel
high 8.8

CVE-2021-34257 json

Unrestricted Upload of File with Dangerous Type in WPanel 4

published 4y ago modified 4mo ago also GHSA-vhgr-gfx3-fg37 , EUVD-2022-1839

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Multiple Remote Code Execution (RCE) vulnerabilities exist in WPanel 4 4.3.1 and below via a malicious PHP file upload to (1) Dashboard's Avatar image, (2) Posts Folder image, (3) Pages Folder image and (4) Gallery Folder image.

Is CVE-2021-34257 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.82% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • latestpcsolution.wordpress.com https://latestpcsolution.wordpress.com/2021/06/05/wpanel4-cms-authenticated-rce/ referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/Sentinal920/WPanel4-Authenticated-RCE referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist wpanel/wpanel4-cms
<=4.3.1
 no fix listed

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Intel 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.