CVE-2025-21623: ClipBucket V5 provides open source video hosting with PHP

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-21623 is a high-severity flaw (CVSS 7.5) 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 - 238, ClipBucket V5 allows unauthenticated attackers to change the template directory via a directory traversal, which results in a denial of service.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-22, CWE-306
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 < 5.5.1-238

Fixed in: 5.5.1-238

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 5.5.1-238 (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-2025-21623?

clipbucket: upgrade to 5.5.1-238. Exact commands for each OS are on this page.

Is CVE-2025-21623 being exploited?

CVE-2025-21623 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-2025-21623 affect?

CVE-2025-21623 affects clipbucket. Severity is high (CVSS 7.5). ClipBucket V5 provides open source video hosting with PHP. Prior to 5.5.1 - 238, ClipBucket V5 allows unauthenticated attackers to change the template directory via a directory traversal, which results in a denial of service.

How urgent is CVE-2025-21623?

Priority 53/100. High 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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