CVE-2023-53942: File Thingie 2.5.7 contains an authenticated file upload vulnerability that allows remote attackers to upload

This month

HIGH 8.8DOWNGRADE

CVE-2023-53942 is a high-severity flaw (CVSS 8.8) affecting file thingie. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

File Thingie 2.5.7 contains an authenticated file upload vulnerability that allows remote attackers to upload malicious PHP zip archives to the web server. Attackers can create a custom PHP payload, upload and unzip it, and then execute arbitrary system commands through a crafted PHP script with a command parameter.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-12-18
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: leefish

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

Am I affected?

Timeline

2025-12-18 20:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

leefish file thingie DOWNGRADE

Affected: 2.5.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5.7

1. Check installed version

apt-cache policy file-thingie || rpm -q file-thingie || file-thingie --version

2. No fixed release: DOWNGRADE to a release before 2.5.7 (Debian / Ubuntu)

apt-cache madison file-thingie sudo apt install file-thingie=<VERSION_BEFORE_2.5.7> sudo apt-mark hold file-thingie

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list file-thingie sudo dnf downgrade file-thingie-<VERSION_BEFORE_2.5.7> sudo dnf versionlock add file-thingie

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-53942?

file thingie: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-53942 being exploited?

CVE-2023-53942 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-2023-53942 affect?

CVE-2023-53942 affects file thingie. Severity is high (CVSS 8.8). File Thingie 2.5.7 contains an authenticated file upload vulnerability that allows remote attackers to upload malicious PHP zip archives to the web server. Attackers can create a custom PHP payload, upload and unzip it, and then execute arb

How urgent is CVE-2023-53942?

Priority 48/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-30580 MEDIUM 4.3 DOWNGRADE File Thingie 2.5.7 is vulnerable to Directory Traversal
CVE-2026-30579 MEDIUM 6.5 DOWNGRADE File Thingie 2.5.7 is vulnerable to Cross Site Scripting (XSS)
CVE-2026-30578 MEDIUM 6.5 DOWNGRADE File Thinghie 2.5.7 is vulnerable to Cross Site Scripting (XSS)

References

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