CVE-2023-45555: File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via a crafted f

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HIGH 7.8DOWNGRADE

CVE-2023-45555 is a high-severity flaw (CVSS 7.8) affecting zzzcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via a crafted file to the down_url function in zzz.php file.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 36%)
CISA exploited list	No
Weakness	CWE-434
Published	2023-10-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zzzcms

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

Am I affected?

Timeline

2023-10-25 18:17 UTCPublished CVE record published
2026-06-17 06:28 UTCUpdated Record last modified

zzzcms zzzcms DOWNGRADE

Affected: 2.1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1.9 (Debian / Ubuntu)

apt-cache madison zzzcms sudo apt install zzzcms=<VERSION_BEFORE_2.1.9> sudo apt-mark hold zzzcms

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

dnf --showduplicates list zzzcms sudo dnf downgrade zzzcms-<VERSION_BEFORE_2.1.9> sudo dnf versionlock add zzzcms

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-2023-45555?

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

Is CVE-2023-45555 being exploited?

CVE-2023-45555 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-2023-45555 affect?

CVE-2023-45555 affects zzzcms. Severity is high (CVSS 7.8). File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via a crafted file to the down_url function in zzz.php file.

How urgent is CVE-2023-45555?

Priority 48/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-5582 LOW 3.5 DOWNGRADE A vulnerability, which was classified as problematic, has been found in ZZZCMS 2.2.0
CVE-2023-5263 MEDIUM 6.3 DOWNGRADE A vulnerability was found in ZZZCMS 2.1.7 and classified as critical
CVE-2023-45554 CRITICAL 9.8 DOWNGRADE File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via modificatio
CVE-2020-19683 MEDIUM 5.4 DOWNGRADE A Cross Site Scripting (XSS) exists in ZZZCMS V1.7.1 via an editfile action in save.php.
CVE-2020-19682 HIGH 8.8 DOWNGRADE A Cross Site Request Forgery (CSRF) vulnerability exits in ZZZCMS V1.7.1 via the save_user funciton in save.ph

References

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