CVE-2021-23428: This affects all versions of package elFinder.NetCore

This month

HIGH 8.6REMOTEMITIGATE

CVE-2021-23428 is a high-severity flaw (CVSS 8.6) affecting elfinder.netcore. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects all versions of package elFinder.NetCore. The Path.Combine(...) method is used to create an absolute file path. Due to missing sanitation of the user input and a missing check of the generated path its possible to escape the Files directory via path traversal

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-09-01
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: elfinder.netcore project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-01 15:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

elfinder.netcore project elfinder.netcore MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy elfinder.netcore || rpm -q elfinder.netcore || elfinder.netcore --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23428?

elfinder.netcore: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-23428 being exploited?

CVE-2021-23428 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23428 affect?

CVE-2021-23428 affects elfinder.netcore. Severity is high (CVSS 8.6). This affects all versions of package elFinder.NetCore. The Path.Combine(...) method is used to create an absolute file path. Due to missing sanitation of the user input and a missing check of the generated path its possible to escape the Fi

How urgent is CVE-2021-23428?

Priority 54/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-23427 HIGH 8.6 MITIGATE This affects all versions of package elFinder.NetCore

References

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