CVE-2023-4520: The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘_fv_

Q: How do I fix CVE-2023-4520?

fv flowplayer video player: upgrade to newer than 7.5.37.7212. Exact commands for each OS are on this page.

Q: Is CVE-2023-4520 being exploited?

CVE-2023-4520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-4520 affect?

CVE-2023-4520 affects fv flowplayer video player. Severity is medium (CVSS 5.4). The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘_fv_player_user_video’ parameter saved via the 'save' function hooked via init, and the plugin is also vulnerable to Arbitrary Usermet

Q: How urgent is CVE-2023-4520?

Priority 36/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.4REMOTEUPGRADE

CVE-2023-4520 is a medium-severity flaw (CVSS 5.4) affecting fv flowplayer video player. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘_fv_player_user_video’ parameter saved via the 'save' function hooked via init, and the plugin is also vulnerable to Arbitrary Usermeta Update via the 'save' function in versions up to, and including, 7.5.37.7212 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrar

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-08-25
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: foliovision

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

Am I affected?

Timeline

2023-08-25 03:15 UTCPublished CVE record published
2026-06-17 06:38 UTCUpdated Record last modified

foliovision fv flowplayer video player UPGRADE

Affected: <= 7.5.37.7212

Fixed in: newer than 7.5.37.7212

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fv-flowplayer-video-player || rpm -q fv-flowplayer-video-player || fv-flowplayer-video-player --version

2. UPGRADE to newer than 7.5.37.7212 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fv-flowplayer-video-player

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fv-flowplayer-video-player

Note

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

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-2023-4520?

fv flowplayer video player: upgrade to newer than 7.5.37.7212. Exact commands for each OS are on this page.

Is CVE-2023-4520 being exploited?

CVE-2023-4520 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-2023-4520 affect?

CVE-2023-4520 affects fv flowplayer video player. Severity is medium (CVSS 5.4). The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘_fv_player_user_video’ parameter saved via the 'save' function hooked via init, and the plugin is also vulnerable to Arbitrary Usermet

How urgent is CVE-2023-4520?

Priority 36/100. Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-6338 HIGH 8.8 UPGRADE The FV Flowplayer Video Player plugin for WordPress is vulnerable to time-based SQL Injection via the ‘exclude
CVE-2023-30499 HIGH 7.1 UPGRADE Unauth

References

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