CVE-2021-43421Elfinder Unrestricted File Upload
elFinder Unrestricted File Upload vulnerability
Published Apr 8, 2022 · Updated Aug 7, 2026 · Also known as GHSA-x4jx-hjwf-gc99
Key Facts
Patch in the next maintenance window- CVE-2021-43421 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Elfinder (Std42), studio-42/elfinder (composer).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 43% probability of exploitation in the next 30 days.
- Fixed versions are available, including Elfinder <=2.1.59, studio-42/elfinder 2.1.60, Elfinder 2.1.59.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
43%
Higher than 98.7% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
A File Upload vulnerability exists in Studio-42 elFinder 2.0.4 to 2.1.59 via connector.minimal.php, which allows a remote malicious user to upload arbitrary files and execute PHP code.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ElfinderStd42 | See advisory | 2.1.59 |
| studio-42/elfindercomposer | >= 2.0.4 | 2.1.60 |
Patched Releases
Elfinder
<=2.1.59
studio-42/elfinder
2.1.60
Timeline
Publicly disclosed
Apr 8, 2022
Last updated
Aug 7, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisorynvd.nist.gov · CVE-2021-43421
- advisoryGHSA advisory
- advisorygithub.com · c08bcbf
- advisorytwitter.com · 1455180286354919425
- exploitgithub.com · 3429
FAQ
Common Questions.
A File Upload vulnerability exists in Studio-42 elFinder 2.0.4 to 2.1.59 via connector.minimal.php, which allows a remote malicious user to upload arbitrary files and execute PHP code.
Affected: Elfinder (Std42); studio-42/elfinder (composer) versions >= 2.0.4. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Elfinder <=2.1.59, studio-42/elfinder 2.1.60, Elfinder 2.1.59.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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