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CVE-2025-59839 — Vulnerability in starcitizenwiki/embedvideo — CVE...

HIGH

Star Citizen EmbedVideo Extension Stored XSS through wikitext caused by usage of non-reserved data attributes

Published September 24, 2025Updated September 10, 2026Source: osv

Summary

### Summary The EmbedVideo extension allows adding arbitrary attributes to an HTML element, allowing for stored XSS through wikitext. ### Details The attributes of an iframe are populated with the value of an unreserved data attribute (`data-iframeconfig`) that can be set via wikitext: https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/ext.embedVideo.videolink.js#L5-L20 Similar code is also present here: https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo/blob/440fb331a84b2050f4cc084c1d31d58a1d1c202d/resources/modules/iframe.js#L139-L155 It is possible to execute JS through attributes like `onload` or `onmouseenter`. ### PoC 1. Create a page with the following contents: ```html <div class="embedvideo-evl" data-iframeconfig='{"onload": "alert(1)"}'>Click me!</div> <evlplayer></evlplayer> ``` 2. Click on the "Click me!" text 3. Click on the "Load video" button below <img width="855" height="404" alt="image" src="https://github.com/user-attachments/assets/afb3839a-012c-4e90-a208-a6137b704ccd" /> ### Impact Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

Advisory Timeline

  • First published September 24, 2025 (383 days ago).
  • Last revised September 10, 2026 — 350 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: packagist (1).

PackageEcosystemAffectedFixed In
starcitizenwiki/embedvideo
packagist
3.0.0, 3.0.1, 3.0.2, 3.0.3 (+22 more)Range-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References

Frequently Asked Questions

What is CVE-2025-59839?
Star Citizen EmbedVideo Extension Stored XSS through wikitext caused by usage of non-reserved data attributes This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.6/10).
How do I check if my project is affected by CVE-2025-59839?
CVE-2025-59839 affects starcitizenwiki/embedvideo. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-59839 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.6

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-4j5h-mvj3-m48v

Related CVEs

  • CVE-2026-55691
    HIGH

    StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized class passed to template

  • CVE-2026-65954
    HIGH

    PHPCSUtils: Remote code execution via eval() in AbstractArrayDeclarationSniff::getActualArrayKey()

  • CVE-2026-61825
    HIGH

    code16/sharp has a stored XSS via data-html-content Sanitizer Bypass

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