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Not in CISA KEV
HIGH severity

CVE-2021-34257 — wpanel4-cms

HIGH

CVE-2021-34257 is a high-severity (CVSS 8.8) Unrestricted File Upload vulnerability in wpanel/wpanel4-cms. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Unrestricted Upload of File with Dangerous Type in WPanel 4

Also known asGHSA-vhgr-gfx3-fg37
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
2 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.42%1.05%1.69%2.32%0.9%1.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘wpanel/wpanel4-cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐘Packagistwpanel/wpanel4-cmsall versionsNo fix

Affected Products

1 product · 1 configurations
Application
wpanel cmswpanel_cms_project
≤ 4.3.1
range
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Multiple Remote Code Execution (RCE) vulnerabilities exist in WPanel 4 4…

github.comNVDApr 2022

Report on latestpcsolution.wordpress.com

latestpcsolution.wordpress.comNVDApr 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wpanel/wpanel4-cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of wpanel/wpanel4-cms for CVE-2021-34257. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

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.
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CVE-2021-34257: wpanel4-cms RCE (High 8.8)