CVE-2021-39350Network attack vector

Script execution via unescaped player_id reflection

Published Oct 6, 2021 · Updated Feb 14, 2025

Reflected XSS in FolioVision FV Flowplayer Video Player 7.5.0.727 through 7.5.2.727 allows remote attackers to run scripts via player_id. The stats view returns the player_id query value in its HTML response without context-appropriate escaping, causing crafted markup to execute in the viewing browser. Exploitation requires a user to open a crafted stats-page request; script execution occurs within that user's WordPress origin and privileges.

CVSS severity6.1
Medium
EPSS probability2.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in FolioVision FV Flowplayer Video Player 7.5.0.727 through 7.5.2.727 allows remote attackers to run scripts via player_id. The stats view returns the player_id query value in its HTML response without context-appropriate escaping, causing crafted markup to execute in the viewing browser. Exploitation requires a user to open a crafted stats-page request; script execution occurs within that user's WordPress origin and privileges.

The record

CVE
CVE-2021-39350
Published
Oct 6, 2021
Updated
Feb 14, 2025
Vendor
FolioVision
Product
FV Flowplayer Video Player
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.5.0.727 - 7.5.2.727 7.5.2.727

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FolioVision · FV Flowplayer Video Playerversion=7.5.0.727 - 7.5.2.727 7.5.2.727

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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