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TabberNeue vulnerable to Stored XSS through wikitext

High severity GitHub Reviewed Published Jun 27, 2025 in StarCitizenTools/mediawiki-extensions-TabberNeue • Updated Jun 27, 2025

Package

composer starcitizentools/tabber-neue (Composer)

Affected versions

>= 3.0.0, < 3.1.1

Patched versions

3.1.1

Description

Summary

Arbitrary HTML can be inserted into the DOM by inserting a payload into any allowed attribute of the <tabber> tag.

Details

The args provided within the wikitext as attributes to the <tabber> tag are passed to the TabberComponentTabs class:
https://github.com/StarCitizenTools/mediawiki-extensions-TabberNeue/blob/3a23b703ce36cfc4128e7921841f68230be4059a/includes/Tabber.php#L76

In TabberComponentTabs, the attributes are validated before being supplied to the Tabs template.
https://github.com/StarCitizenTools/mediawiki-extensions-TabberNeue/blob/3a23b703ce36cfc4128e7921841f68230be4059a/includes/Components/TabberComponentTabs.php#L15-L31
However, the validation is insufficient.
What Sanitizer::validateTagAttributes does is call validateAttributes, which

	 * - Discards attributes not on the given list
	 * - Unsafe style attributes are discarded
	 * - Invalid id attributes are re-encoded

However, the attribute values are expected to be escaped when inserted into HTML.

The attribute values are then inserted into HTML without being escaped:
https://github.com/StarCitizenTools/mediawiki-extensions-TabberNeue/blob/3a23b703ce36cfc4128e7921841f68230be4059a/includes/templates/Tabs.mustache#L1

PoC

XSS through attributes:

  1. Go to Special:ExpandTemplates and insert the following wikitext:
<tabber class='test123" onmouseenter="alert(1)"'>
|-|First Tab Title=
First tab content goes here.
</tabber>
  1. Press "OK"
  2. Hover over the tabber

image

XSS through script tags:

  1. Go to Special:ExpandTemplates and insert the following wikitext:
<tabber class='test123"&gt;&lt;script&gt;alert(2)&lt;/script&gt;'>
|-|First Tab Title=
First tab content goes here.
</tabber>
  1. Press "OK"
    image

Impact

Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

References

@alistair3149 alistair3149 published to StarCitizenTools/mediawiki-extensions-TabberNeue Jun 27, 2025
Published by the National Vulnerability Database Jun 27, 2025
Published to the GitHub Advisory Database Jun 27, 2025
Reviewed Jun 27, 2025
Last updated Jun 27, 2025

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

EPSS score

Weaknesses

CVE ID

CVE-2025-53093

GHSA ID

GHSA-jfj7-249r-7j2m

Source code

Credits

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