CVE-2023-53924: UliCMS 2023.1-sniffing-vicuna contains a remote code execution vulnerability that allows authenticated attacke

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HIGH 8.8DOWNGRADE

CVE-2023-53924 is a high-severity flaw (CVSS 8.8) affecting ulicms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

UliCMS 2023.1-sniffing-vicuna contains a remote code execution vulnerability that allows authenticated attackers to upload PHP files with .phar extension during profile avatar upload. Attackers can trigger code execution by visiting the uploaded file's location, enabling system command execution through maliciously crafted avatar uploads.

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	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-12-17
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: ulicms

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

Am I affected?

Timeline

2025-12-17 23:15 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

ulicms ulicms DOWNGRADE

Affected: 2023.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2023.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2023.1 (Debian / Ubuntu)

apt-cache madison ulicms sudo apt install ulicms=<VERSION_BEFORE_2023.1> sudo apt-mark hold ulicms

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

dnf --showduplicates list ulicms sudo dnf downgrade ulicms-<VERSION_BEFORE_2023.1> sudo dnf versionlock add ulicms

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-2023-53924?

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

Is CVE-2023-53924 being exploited?

CVE-2023-53924 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-2023-53924 affect?

CVE-2023-53924 affects ulicms. Severity is high (CVSS 8.8). UliCMS 2023.1-sniffing-vicuna contains a remote code execution vulnerability that allows authenticated attackers to upload PHP files with .phar extension during profile avatar upload. Attackers can trigger code execution by visiting the upl

How urgent is CVE-2023-53924?

Priority 51/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-53925 MEDIUM 6.1 DOWNGRADE UliCMS 2023.1 contains a stored cross-site scripting vulnerability that allows attackers to upload malicious S
CVE-2023-53923 CRITICAL 9.8 DOWNGRADE UliCMS 2023.1 contains a privilege escalation vulnerability that allows unauthenticated attackers to create ad
CVE-2023-53914 CRITICAL 9.8 DOWNGRADE UliCMS 2023.1 contains an authentication bypass vulnerability that allows unauthenticated attackers to create

References

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