CVE-2026-66637Network attack vector

Stored XSS via raw embed rendering

Published Aug 18, 2026 · Updated Aug 18, 2026

Stored XSS in Featured Video Plus 2.3.3 and earlier allows remote authenticated users to run script in visitors' browsers via featured-video input. The metabox save path accepts the fvp_video field, classifies tagged input as provider raw, and later renders meta full with do_shortcode(), while the Legal HTML setting can whitelist iframe, embed, or object tags. Exploitation requires contributor-level post editing and, per the plugin settings code, administrator-enabled insecure raw embed handling; when reached, script executes in the site's origin wherever the featured video is displayed.

CVSS severity6.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Featured Video Plus 2.3.3 and earlier allows remote authenticated users to run script in visitors' browsers via featured-video input. The metabox save path accepts the fvp_video field, classifies tagged input as provider raw, and later renders meta full with do_shortcode(), while the Legal HTML setting can whitelist iframe, embed, or object tags. Exploitation requires contributor-level post editing and, per the plugin settings code, administrator-enabled insecure raw embed handling; when reached, script executes in the site's origin wherever the featured video is displayed.

The record

CVE
CVE-2026-66637
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Alex
Product
Featured Video Plus
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record 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=n/a <=2.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Alex · Featured Video Plusversion=n/a <=2.3.3

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

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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