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CVE-2021-34257

28
FAUCET Score

CVE-2021-34257 describes multiple Remote Code Execution (RCE) vulnerabilities in WPanel 4 CMS versions 4.3.1 and below. These vulnerabilities allow an authenticated attacker to upload malicious PHP files through various image upload functionalities, such as the Dashboard avatar or image uploads within Posts, Pages, and Gallery folders. With a CVSS score of 8.8 (High), this flaw presents a significant risk due to its low attack complexity and potential for complete compromise of confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3.1CPE matchmatch criteria
cpe:2.3:a:wpanel_cms_project:wpanel_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.71%
Probability of exploitation in next 30 days
EPSS Percentile
74.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0171 is in the 73rd percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

composerGHSA-vhgr-gfx3-fg37high

Unrestricted Upload of File with Dangerous Type in WPanel 4

Apr 1, 2022

References

github.com / Sentinal920/WPanel4-Authenticated-RCE
ExploitThird Party Advisory
latestpcsolution.wordpress.com / 2021/06/05/wpanel4-cms-authenticated-rce
ExploitThird Party Advisory