CVE-2026-55691Public exploitNetwork attack vector

Stored XSS via unescaped class template substitution

Published Sep 15, 2026 · Updated Sep 15, 2026

Stored XSS in Star Citizen Wiki EmbedVideo before 4.1.0 allows remote authenticated users to execute JavaScript through edited wikitext. EmbedHtmlFormatter::toHtml passes the user-controlled class value directly to sprintf when constructing a figure element, so a quote terminates the class attribute and injects arbitrary HTML attributes or markup. Page-edit permission is required, and the stored script runs in visitors' browsers when they render the affected page.

CVSS severity8.6
High
EPSS probability0.29%
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 Star Citizen Wiki EmbedVideo before 4.1.0 allows remote authenticated users to execute JavaScript through edited wikitext. EmbedHtmlFormatter::toHtml passes the user-controlled class value directly to sprintf when constructing a figure element, so a quote terminates the class attribute and injects arbitrary HTML attributes or markup. Page-edit permission is required, and the stored script runs in visitors' browsers when they render the affected page.

The record

CVE
CVE-2026-55691
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Star Citizen Wiki
Product
EmbedVideo
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record 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=< 4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Star Citizen Wiki · EmbedVideoversion=< 4.1.0

Published CVSS scores

8.6GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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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