CVE-2025-21624: ClipBucket V5 provides open source video hosting with PHP

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-21624 is a critical-severity flaw (CVSS 9.8) affecting clipbucket. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ClipBucket V5 provides open source video hosting with PHP. Prior to 5.5.1 - 239, a file upload vulnerability exists in the Manage Playlist functionality of the application, specifically surrounding the uploading of playlist cover images. Without proper checks, an attacker can upload a PHP script file instead of an image file, thus allowing a webshell or other malicious files to be stored and executed on the server. This attack vector exists in bo

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-01-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: oxygenz

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

Am I affected?

Timeline

2025-01-07 16:15 UTCPublished CVE record published
2026-06-17 08:43 UTCUpdated Record last modified

oxygenz clipbucket UPGRADE

Affected: >= 5.3 and < 5.5.1-239

Fixed in: 5.5.1-239

Safe to downgrade to: a release before 5.3

1. Check installed version

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

2. UPGRADE to 5.5.1-239 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade clipbucket

Note

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

3. If no update is available yet, DOWNGRADE to a release before 5.3 (Debian / Ubuntu)

apt-cache madison clipbucket sudo apt install clipbucket=<VERSION_BEFORE_5.3> sudo apt-mark hold clipbucket

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list clipbucket sudo dnf downgrade clipbucket-<VERSION_BEFORE_5.3> sudo dnf versionlock add clipbucket

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-2025-21624?

clipbucket: upgrade to 5.5.1-239. Exact commands for each OS are on this page.

Is CVE-2025-21624 being exploited?

CVE-2025-21624 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-2025-21624 affect?

CVE-2025-21624 affects clipbucket. Severity is critical (CVSS 9.8). ClipBucket V5 provides open source video hosting with PHP. Prior to 5.5.1 - 239, a file upload vulnerability exists in the Manage Playlist functionality of the application, specifically surrounding the uploading of playlist cover images. Wi

How urgent is CVE-2025-21624?

Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-62715 MEDIUM 5.4 UPGRADE ClipBucket v5 is an open source video sharing platform
CVE-2025-62709 MEDIUM 6.8 UPGRADE ClipBucket v5 is an open source video sharing platform
CVE-2025-62424 MEDIUM 6.7 UPGRADE ClipBucket is a web-based video-sharing platform
CVE-2025-62423 MEDIUM 6.7 UPGRADE ClipBucket V5 provides open source video hosting with PHP
CVE-2025-62429 HIGH 7.2 UPGRADE ClipBucket v5 is an open source video sharing platform

References

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