CVE-2023-45554: File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via modificatio

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-45554 is a critical-severity flaw (CVSS 9.8) 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 modification of the imageext parameter from jpg, jpeg,gif, and png to jpg, jpeg,gif, png, pphphp.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
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-2023-45554?

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

Is CVE-2023-45554 being exploited?

CVE-2023-45554 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-2023-45554 affect?

CVE-2023-45554 affects zzzcms. Severity is critical (CVSS 9.8). File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via modification of the imageext parameter from jpg, jpeg,gif, and png to jpg, jpeg,gif, png, pphphp.

How urgent is CVE-2023-45554?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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-2023-45555 HIGH 7.8 DOWNGRADE File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via a crafted f
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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