CVE-2016-20023: In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server i

Q: How do I fix CVE-2016-20023?

ckfinder: upgrade to 2.5.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2016-20023 being exploited?

CVE-2016-20023 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-20023 affect?

CVE-2016-20023 affects ckfinder. Severity is medium (CVSS 5.0). In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server if the correct path to a file was provided.

Q: How urgent is CVE-2016-20023?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2016-20023 is a medium-severity flaw (CVSS 5.0) affecting ckfinder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server if the correct path to a file was provided.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-23, CWE-22
Published	2025-12-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cksource

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

Am I affected?

Timeline

2025-12-05 06:16 UTCPublished CVE record published
2026-06-17 00:43 UTCUpdated Record last modified

cksource ckfinder UPGRADE

Affected: < 2.5.0.1

Fixed in: 2.5.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ckfinder || rpm -q ckfinder || ckfinder --version

2. UPGRADE to 2.5.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ckfinder

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ckfinder

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2016-20023?

ckfinder: upgrade to 2.5.0.1. Exact commands for each OS are on this page.

Is CVE-2016-20023 being exploited?

CVE-2016-20023 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-2016-20023 affect?

CVE-2016-20023 affects ckfinder. Severity is medium (CVSS 5.0). In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server if the correct path to a file was provided.

How urgent is CVE-2016-20023?

Priority 24/100. No elevated risk signals yet.

Software pages

.NET vulnerabilities

Related CVEs

CVE-2025-63830 MEDIUM 6.1 DOWNGRADE CKFinder 1.4.3 is vulnerable to Cross Site Scripting (XSS) in the File Upload function

References

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