CVE-2025-59839Public exploitNetwork attack vector

Stored XSS via unreserved iframe configuration attributes

Published Sep 25, 2025 · Updated Sep 25, 2025

Stored XSS in Star Citizen Tools EmbedVideo 4.0.0 and earlier allows remote attackers to execute JavaScript via crafted wikitext. The client code parses user-controlled JSON from data-iframeconfig and applies every entry to an iframe with setAttribute, accepting event handlers such as onload. Exploitation requires crafted page content and a visitor to activate the video controls, after which script runs in that visitor’s browser context.

CVSS severity8.6
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Star Citizen Tools EmbedVideo 4.0.0 and earlier allows remote attackers to execute JavaScript via crafted wikitext. The client code parses user-controlled JSON from data-iframeconfig and applies every entry to an iframe with setAttribute, accepting event handlers such as onload. Exploitation requires crafted page content and a visitor to activate the video controls, after which script runs in that visitor’s browser context.

The record

CVE
CVE-2025-59839
Published
Sep 25, 2025
Updated
Sep 25, 2025
Vendor
Star Citizen Tools
Product
EmbedVideo
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=<= 4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Star Citizen Tools · EmbedVideoversion=<= 4.0.0

Published CVSS scores

8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo